diff --git a/frontend/src/composables/assetTypeIds.js b/frontend/src/composables/assetTypeIds.js
new file mode 100644
index 00000000..eb013aef
--- /dev/null
+++ b/frontend/src/composables/assetTypeIds.js
@@ -0,0 +1,56 @@
+// Asset-type ids resolved by NAME, once per page load.
+//
+// Four asset forms carried a hardcoded id - `const COMPUTER_ASSETTYPEID = 2`,
+// and the same for machines, printers and network devices - to tell
+// CustomFieldsInputs which type's fields to render. The ids come from seed
+// order, not from anything stable: on the instance those constants were written
+// against, computer was 2; on a freshly seeded one it is 1 and 2 is
+// network_device. So the PC form asked for another type's custom fields,
+// rendered them, and dropped whatever the operator typed - with a success
+// toast, because the values were keyed to a type the record does not have.
+//
+// A name is the stable thing. `assettype` is a fixed vocabulary (ADR-001) and
+// the API already publishes the mapping; nothing else should hardcode a number.
+import { reactive } from 'vue'
+import { assetsApi } from '../api'
+
+const state = reactive({
+  byname: {},
+  loaded: false
+})
+
+let inflight = null
+
+export async function loadAssetTypeIds() {
+  if (state.loaded) return state
+  if (inflight) return inflight
+  inflight = assetsApi.types.list()
+    .then((response) => {
+      const rows = response?.data?.data || response?.data || []
+      const byname = {}
+      rows.forEach((row) => {
+        if (row && row.assettype) byname[row.assettype] = row.assettypeid
+      })
+      state.byname = byname
+      state.loaded = true
+      return state
+    })
+    .catch(() => {
+      // Leave it unloaded rather than caching a failure: a form that could not
+      // resolve its type renders no custom fields, which is honest. Guessing an
+      // id is what caused the defect this replaces.
+      state.loaded = false
+      return state
+    })
+    .finally(() => { inflight = null })
+  return inflight
+}
+
+// Undefined until loaded, and undefined for a name the server does not know.
+// CustomFieldsInputs treats an undefined assettypeid as "nothing to render",
+// which is the safe reading: better a missing panel than the wrong type's.
+export function assetTypeId(name) {
+  return state.byname[name]
+}
+
+export { state }
diff --git a/frontend/src/composables/assetTypeIds.spec.js b/frontend/src/composables/assetTypeIds.spec.js
new file mode 100644
index 00000000..995d01cd
--- /dev/null
+++ b/frontend/src/composables/assetTypeIds.spec.js
@@ -0,0 +1,94 @@
+// Asset-type ids must come from the server by name.
+//
+// Four forms hardcoded the id. Those constants were written against one
+// instance's seed order and were wrong on another: PCForm said 2, and on a
+// freshly seeded database 2 is network_device. The form asked
+// CustomFieldsInputs for that type's fields, rendered them, and dropped what
+// the operator typed - with a success toast, because the values were keyed to
+// a type the record does not have.
+import { describe, it, expect, vi, beforeEach } from 'vitest'
+
+vi.mock('../api', () => ({
+  assetsApi: {
+    types: {
+      list: vi.fn()
+    }
+  }
+}))
+
+import { assetsApi } from '../api'
+import { loadAssetTypeIds, assetTypeId, state } from './assetTypeIds'
+
+function reset() {
+  state.byname = {}
+  state.loaded = false
+  assetsApi.types.list.mockReset()
+}
+
+describe('assetTypeIds', () => {
+  beforeEach(reset)
+
+  it('resolves an id by name from what the server actually has', async () => {
+    assetsApi.types.list.mockResolvedValue({
+      data: { data: [
+        { assettypeid: 1, assettype: 'computer' },
+        { assettypeid: 2, assettype: 'network_device' },
+        { assettypeid: 4, assettype: 'machine' }
+      ] }
+    })
+
+    await loadAssetTypeIds()
+
+    expect(assetTypeId('computer')).toBe(1)
+    expect(assetTypeId('network_device')).toBe(2)
+    expect(assetTypeId('machine')).toBe(4)
+  })
+
+  it('survives a differently seeded site, which is the whole point', async () => {
+    // The same names, different ids. A hardcoded 2 would be network_device
+    // here and computer in the other fixture.
+    assetsApi.types.list.mockResolvedValue({
+      data: { data: [
+        { assettypeid: 2, assettype: 'computer' },
+        { assettypeid: 3, assettype: 'network_device' }
+      ] }
+    })
+
+    await loadAssetTypeIds()
+
+    expect(assetTypeId('computer')).toBe(2)
+    expect(assetTypeId('network_device')).toBe(3)
+  })
+
+  it('fetches once even when several forms ask at the same time', async () => {
+    assetsApi.types.list.mockResolvedValue({
+      data: { data: [{ assettypeid: 1, assettype: 'computer' }] }
+    })
+
+    await Promise.all([loadAssetTypeIds(), loadAssetTypeIds(), loadAssetTypeIds()])
+    await loadAssetTypeIds()
+
+    expect(assetsApi.types.list).toHaveBeenCalledTimes(1)
+  })
+
+  it('returns undefined rather than a guess when the load fails', async () => {
+    assetsApi.types.list.mockRejectedValue(new Error('network down'))
+
+    await loadAssetTypeIds()
+
+    // Undefined means CustomFieldsInputs renders nothing. A missing panel is
+    // honest; the wrong type's panel is what this replaces.
+    expect(assetTypeId('computer')).toBeUndefined()
+    expect(state.loaded).toBe(false)
+  })
+
+  it('returns undefined for a type the server does not know', async () => {
+    assetsApi.types.list.mockResolvedValue({
+      data: { data: [{ assettypeid: 1, assettype: 'computer' }] }
+    })
+
+    await loadAssetTypeIds()
+
+    expect(assetTypeId('forklift')).toBeUndefined()
+  })
+})
diff --git a/plugins/computers/frontend/views/PCForm.vue b/plugins/computers/frontend/views/PCForm.vue
index 6924908f..13b64e20 100644
--- a/plugins/computers/frontend/views/PCForm.vue
+++ b/plugins/computers/frontend/views/PCForm.vue
@@ -373,6 +373,7 @@ import CustomFieldsInputs from '@/components/CustomFieldsInputs.vue'
 import PrinterAssignmentPicker from '@/components/PrinterAssignmentPicker.vue'
 import { currentTheme } from '@/stores/theme'
 import { useIdentifierFlags } from '@/composables/identifierSettings'
+import { loadAssetTypeIds, assetTypeId } from '@/composables/assetTypeIds'
 import { isPluginEnabled, loadEnabledPlugins } from '@/composables/enabledPlugins'
 import { useToast } from '@/composables/toast'
 import { apiError } from '@/utils/apiError'
@@ -390,9 +391,11 @@ const isEdit = computed(() => !!route.params.id)
 // falls back to the PCs list.
 const returnTo = computed(() => (route.query.from === 'fleet' ? '/endpoints' : '/pcs'))
 
-// Seeded asset-type id for computers (see /api/assets/types). Custom-field
-// values are keyed by the underlying asset id, captured on load / create.
-const COMPUTER_ASSETTYPEID = 2
+// Resolved by NAME at load, never hardcoded: the id comes from seed
+// order, so the constant that used to live here pointed at a different
+// asset type on a differently-seeded site - the form then rendered THAT
+// type's custom fields and dropped whatever was typed into them.
+const COMPUTER_ASSETTYPEID = computed(() => assetTypeId('computer'))
 const customFieldsRef = ref(null)
 const printerPickerRef = ref(null)
 const currentAssetId = ref(null)
@@ -519,6 +522,7 @@ const filteredVendors = computed(() => {
 })
 
 onMounted(async () => {
+  await loadAssetTypeIds()
   try {
     // Load reference data
     // perpage 100 so dropdowns aren't truncated to the default 20-row page
@@ -649,7 +653,13 @@ async function savePC() {
       notes: form.value.notes || null,
       ipaddress: form.value.ipaddress || null,
       mapx: form.value.mapx,
-      mapy: form.value.mapy
+      mapy: form.value.mapy,
+      // ADR-017: a position without its level cannot be drawn on the right
+      // floor plan. The picker sets all three and this payload sent two, so a
+      // picked pin saved a levelid of null and then rendered nowhere - the
+      // form even showed "Position: x, y" back, because it kept the value it
+      // had never sent.
+      levelid: form.value.levelid
     }
     // only set display name when an alias is given, so we don't clobber it
     if (form.value.alias) {
diff --git a/plugins/machines/frontend/views/MachineForm.vue b/plugins/machines/frontend/views/MachineForm.vue
index 4f159a5c..6350c449 100644
--- a/plugins/machines/frontend/views/MachineForm.vue
+++ b/plugins/machines/frontend/views/MachineForm.vue
@@ -416,6 +416,7 @@ import CustomFieldsInputs from '@/components/CustomFieldsInputs.vue'
 import PrinterAssignmentPicker from '@/components/PrinterAssignmentPicker.vue'
 import { currentTheme } from '@/stores/theme'
 import { useIdentifierFlags } from '@/composables/identifierSettings'
+import { loadAssetTypeIds, assetTypeId } from '@/composables/assetTypeIds'
 import { apiError } from '@/utils/apiError'
 import { planControllingPcChange } from './controllingPc'
 
@@ -426,8 +427,11 @@ const router = useRouter()
 
 const isEdit = computed(() => !!route.params.id)
 
-// Seeded asset-type id for machines (see /api/assets/types).
-const MACHINE_ASSETTYPEID = 1
+// Resolved by NAME at load, never hardcoded: the id comes from seed
+// order, so the constant that used to live here pointed at a different
+// asset type on a differently-seeded site - the form then rendered THAT
+// type's custom fields and dropped whatever was typed into them.
+const MACHINE_ASSETTYPEID = computed(() => assetTypeId('machine'))
 const customFieldsRef = ref(null)
 const printerPickerRef = ref(null)
 const currentAssetId = ref(null)
@@ -571,6 +575,7 @@ watch(() => form.value.controllervendorid, (newVal, oldVal) => {
 })
 
 onMounted(async () => {
+  await loadAssetTypeIds()
   try {
     // Load reference data in parallel
     const [typesRes, statusRes, vendorRes, locRes, allModels, buRes, pcsRes, relTypesRes] = await Promise.all([
@@ -763,7 +768,13 @@ async function saveMachine() {
       maintenanceintervaldays: form.value.maintenanceintervaldays || null,
       notes: form.value.notes || null,
       mapx: form.value.mapx,
-      mapy: form.value.mapy
+      mapy: form.value.mapy,
+      // ADR-017: a position without its level cannot be drawn on the right
+      // floor plan. The picker sets all three and this payload sent two, so a
+      // picked pin saved a levelid of null and then rendered nowhere - the
+      // form even showed "Position: x, y" back, because it kept the value it
+      // had never sent.
+      levelid: form.value.levelid
     }
 
     let savedMachine
diff --git a/plugins/network/frontend/views/NetworkDeviceForm.vue b/plugins/network/frontend/views/NetworkDeviceForm.vue
index ff6c6ef1..e3b6cf4d 100644
--- a/plugins/network/frontend/views/NetworkDeviceForm.vue
+++ b/plugins/network/frontend/views/NetworkDeviceForm.vue
@@ -334,6 +334,7 @@ import { loadMapConfig, levelOptions, levelName, state as mapConfig }
 import Modal from '@/components/Modal.vue'
 import { currentTheme } from '@/stores/theme'
 import { useIdentifierFlags } from '@/composables/identifierSettings'
+import { loadAssetTypeIds, assetTypeId } from '@/composables/assetTypeIds'
 import { apiError } from '@/utils/apiError'
 
 const { isEnabled } = useIdentifierFlags()
@@ -350,8 +351,11 @@ const router = useRouter()
 const deviceId = route.params.id
 const isEdit = computed(() => !!deviceId)
 
-// Seeded asset-type id for network devices (see /api/assets/types).
-const NETWORK_ASSETTYPEID = 3
+// Resolved by NAME at load, never hardcoded: the id comes from seed
+// order, so the constant that used to live here pointed at a different
+// asset type on a differently-seeded site - the form then rendered THAT
+// type's custom fields and dropped whatever was typed into them.
+const NETWORK_ASSETTYPEID = computed(() => assetTypeId('network_device'))
 const customFieldsRef = ref(null)
 const currentAssetId = ref(null)
 
@@ -424,6 +428,7 @@ const saving = ref(false)
 const error = ref('')
 
 onMounted(async () => {
+  await loadAssetTypeIds()
   await Promise.all([
     loadDeviceTypes(),
     loadVendors(),
diff --git a/plugins/printers/frontend/views/PrinterForm.vue b/plugins/printers/frontend/views/PrinterForm.vue
index 9a92f7d8..b5a2932d 100644
--- a/plugins/printers/frontend/views/PrinterForm.vue
+++ b/plugins/printers/frontend/views/PrinterForm.vue
@@ -336,6 +336,7 @@ import Modal from '@/components/Modal.vue'
 import CustomFieldsInputs from '@/components/CustomFieldsInputs.vue'
 import { currentTheme } from '@/stores/theme'
 import { useIdentifierFlags } from '@/composables/identifierSettings'
+import { loadAssetTypeIds, assetTypeId } from '@/composables/assetTypeIds'
 import { apiError } from '@/utils/apiError'
 import { getPrinterHostnameTemplate } from '@/utils/siteSettings'
 
@@ -346,8 +347,11 @@ const router = useRouter()
 
 const isEdit = computed(() => !!route.params.id)
 
-// Seeded asset-type id for printers (see /api/assets/types).
-const PRINTER_ASSETTYPEID = 4
+// Resolved by NAME at load, never hardcoded: the id comes from seed
+// order, so the constant that used to live here pointed at a different
+// asset type on a differently-seeded site - the form then rendered THAT
+// type's custom fields and dropped whatever was typed into them.
+const PRINTER_ASSETTYPEID = computed(() => assetTypeId('printer'))
 const customFieldsRef = ref(null)
 const currentAssetId = ref(null)
 const manualHostname = ref(false)
@@ -542,6 +546,7 @@ function onWindowsNameInput() {
 }
 
 onMounted(async () => {
+  await loadAssetTypeIds()
   try {
     // Load reference data (models paged in full via listAll, see api/index.js)
     // perpage 100 so dropdowns aren't truncated to the default 20-row page
@@ -686,7 +691,13 @@ async function savePrinter() {
       isduplex: !!form.value.isduplex,
       isnetwork: !!form.value.isnetwork,
       mapx: form.value.mapx,
-      mapy: form.value.mapy
+      mapy: form.value.mapy,
+      // ADR-017: a position without its level cannot be drawn on the right
+      // floor plan. The picker sets all three and this payload sent two, so a
+      // picked pin saved a levelid of null and then rendered nowhere - the
+      // form even showed "Position: x, y" back, because it kept the value it
+      // had never sent.
+      levelid: form.value.levelid
     }
     // only set the display name when an alias is given, so we don't clobber it
     if (form.value.alias) {
diff --git a/scripts/check-naming-and-style.sh b/scripts/check-naming-and-style.sh
index b251c412..d6743f82 100755
--- a/scripts/check-naming-and-style.sh
+++ b/scripts/check-naming-and-style.sh
@@ -191,11 +191,19 @@ while IFS= read -r hit; do
     [ -z "$hit" ] && continue
     file=${hit%%:*}
     line=${hit#*:}; line=${line%%:*}
-    if ! sed -n "${line},$((line + 8))p" "$file" | grep -q "'levelid'"; then
+    # Python writes 'levelid', Vue writes levelid: - accept either, so the
+    # check covers the payloads a browser sends as well as the ones the server
+    # emits. It was Python-only, which is how three asset forms shipped a
+    # position with no level.
+    if ! sed -n "${line},$((line + 8))p" "$file" | grep -qE "'levelid'|levelid:"; then
         MISSING_LEVEL="$MISSING_LEVEL$file:$line"$'\n'
     fi
 done <<EOF
 $(grep -rn "'mapx':" --include='*.py' shopdb/ plugins/ scripts/ 2>/dev/null | grep -v '/tests\?/' || true)
+$(grep -rn "mapx: " --include='*.vue' --include='*.js' \
+    frontend/src plugins/*/frontend 2>/dev/null \
+    | grep -v '.plugins-staged' | grep -v '\.spec\.js' \
+    | grep -vE "mapx: (null|0)," || true)
 EOF
 if [ -n "$MISSING_LEVEL" ]; then
     echo "FAIL: these emit 'mapx' with no 'levelid' beside it - a position with no"