diff --git a/tests/test_platforms.py b/tests/test_platforms.py
index 355ab54..43235eb 100644
--- a/tests/test_platforms.py
+++ b/tests/test_platforms.py
@@ -177,6 +177,29 @@ class TestTaskCreationGuard:
         tasks = (await client.get("/api/monitor/tasks")).json()["tasks"]
         assert {t["platform"] for t in tasks} == {"xhs"}
 
+    @pytest.mark.asyncio
+    async def test_an_explicit_platform_is_honoured_on_create(self, client):
+        """建任务时给的平台必须落到那个平台。
+
+        缺省值是小红的（接口早期的兼容行为），所以「在抖音页面建任务」如果没有显式
+        带上 platform，就会安安静静地变成一个小红书任务 —— 不报错，只是出现在另一
+        个列表里。前端那半边已经改成必传；这里守住后端这一半：给了就必须用。
+        """
+        sec_uid = "MS4wLjABAAAATJPY7LAlaa5X-c8uNdWkvz0jUGgpw4eeXIwu_8BhvqE"
+        created = await client.post(
+            "/api/monitor/tasks",
+            json={"name": "抖音任务", "mode": "creator", "platform": "dy", "targets": [sec_uid]},
+        )
+        assert created.status_code == 201
+
+        assert (await client.get("/api/monitor/tasks", params={"platform": "xhs"})).json()[
+            "tasks"
+        ] == []
+        dy_tasks = (
+            await client.get("/api/monitor/tasks", params={"platform": "dy"})
+        ).json()["tasks"]
+        assert [t["name"] for t in dy_tasks] == ["抖音任务"]
+
 
 class TestPlatformScoping:
     async def _seed_two_platforms(self, client):
diff --git a/webui/src/components/monitor/TaskCard.tsx b/webui/src/components/monitor/TaskCard.tsx
index e370813..43e453d 100644
--- a/webui/src/components/monitor/TaskCard.tsx
+++ b/webui/src/components/monitor/TaskCard.tsx
@@ -3,6 +3,7 @@ import { Bell, CalendarClock, Pencil, Play, Trash2 } from 'lucide-react'
 import { Badge } from '@/components/ui/badge'
 import { Button } from '@/components/ui/button'
 import { useDeleteTask, useRunTaskNow, useUpdateTask } from '@/hooks/useMonitor'
+import { useCurrentPlatform } from '@/hooks/usePlatform'
 import { formatRelative } from '@/lib/monitorFormat'
 import type { MonitorTask } from '@/types/monitor'
 
@@ -46,6 +47,12 @@ export function TaskCard({ task, selected, onSelect, onEdit }: TaskCardProps) {
   const updateTask = useUpdateTask()
   const deleteTask = useDeleteTask()
   const runNow = useRunTaskNow()
+  // 按**任务自己的**平台取措辞，而不是当前平台 —— 卡片未必只出现在同平台的列表里。
+  // 抖音管它们叫「作品」，小红书叫「笔记」，写死一个对另一个就是错的。
+  const { platforms } = useCurrentPlatform()
+  const noteNoun =
+    platforms.find((entry) => entry.value === task.platform)?.target_hints?.note_label ??
+    '笔记'
 
   // A suspected cookie failure surfaces here so it is visible without opening
   // the event feed.
@@ -65,7 +72,7 @@ export function TaskCard({ task, selected, onSelect, onEdit }: TaskCardProps) {
           <div className="flex items-center gap-2 flex-wrap">
             <span className="font-mono text-sm text-cyber-text-primary truncate">{task.name}</span>
             <Badge variant="outline" className="text-[10px]">
-              {task.mode === 'creator' ? '博主' : '笔记'}
+              {task.mode === 'creator' ? '博主' : noteNoun}
             </Badge>
             <Badge variant={statusVariant(task.last_status)} className="text-[10px]">
               {STATUS_LABEL[task.last_status] ?? task.last_status}
diff --git a/webui/src/components/monitor/TaskEditorDialog.tsx b/webui/src/components/monitor/TaskEditorDialog.tsx
index 72b48df..056ed4d 100644
--- a/webui/src/components/monitor/TaskEditorDialog.tsx
+++ b/webui/src/components/monitor/TaskEditorDialog.tsx
@@ -109,7 +109,7 @@ export function TaskEditorDialog({ open, onOpenChange, task }: TaskEditorDialogP
   const { data: settings } = useSettings()
   // 示例链接和措辞都由服务端的能力矩阵给 —— 前端不自己判断平台，否则加一个平台
   // 就要改这里一次，而且很容易漏。
-  const { capability } = useCurrentPlatform()
+  const { capability, platform } = useCurrentPlatform()
   const hints = capability?.target_hints
 
   const [name, setName] = useState('')
@@ -179,6 +179,9 @@ export function TaskEditorDialog({ open, onOpenChange, task }: TaskEditorDialogP
   const handleSubmit = () => {
     const payload: TaskCreatePayload = {
       name: name.trim(),
+      // 当前平台。漏掉这一项，后端会退回小红书 —— 表现是「在抖音页面建的任务
+      // 跑到小红书列表里去了」，而且不报任何错。
+      platform,
       mode,
       interval_minutes: Number(intervalMinutes),
       schedule_mode: scheduleMode,
@@ -199,7 +202,11 @@ export function TaskEditorDialog({ open, onOpenChange, task }: TaskEditorDialogP
 
     const done = () => onOpenChange(false)
     if (isEdit && task) {
-      updateTask.mutate({ id: task.id, payload }, { onSuccess: done })
+      // 平台创建后不可更改，更新请求里就不带它了 —— 带着会让「平台能被改」这件事
+      // 看起来像是真的。
+      const updatePayload: Partial<TaskCreatePayload> = { ...payload }
+      delete updatePayload.platform
+      updateTask.mutate({ id: task.id, payload: updatePayload }, { onSuccess: done })
     } else {
       createTask.mutate(payload, { onSuccess: done })
     }
@@ -241,7 +248,7 @@ export function TaskEditorDialog({ open, onOpenChange, task }: TaskEditorDialogP
                 </SelectTrigger>
                 <SelectContent>
                   <SelectItem value="creator">博主（监控其作品）</SelectItem>
-                  <SelectItem value="note">笔记（批量监控指定内容）</SelectItem>
+                  <SelectItem value="note">{`${hints?.note_label ?? '笔记'}（批量监控指定内容）`}</SelectItem>
                 </SelectContent>
               </Select>
               {isEdit && (
@@ -432,7 +439,7 @@ export function TaskEditorDialog({ open, onOpenChange, task }: TaskEditorDialogP
                 </>
               ) : (
                 <p className="text-[10px] font-mono text-cyber-neon-orange">
-                  笔记模式下此项不生效：你列出的每个链接都会被逐条抓取。
+                  {hints?.note_label ?? '笔记'}模式下此项不生效：你列出的每个链接都会被逐条抓取。
                 </p>
               )}
             </div>
diff --git a/webui/src/types/monitor.ts b/webui/src/types/monitor.ts
index 49a3815..bf3ae0e 100644
--- a/webui/src/types/monitor.ts
+++ b/webui/src/types/monitor.ts
@@ -250,6 +250,13 @@ export interface MonitorOverview {
 
 export interface TaskCreatePayload {
   name: string
+  /**
+   * 任务归属的平台。
+   *
+   * **必须显式带上。** 后端在缺省时会退回小红书 —— 那是接口早期的兼容行为，
+   * 于是「在抖音页面上建任务」会安安静静地建出一个小红书任务（遇到过）。
+   */
+  platform: string
   mode: MonitorMode
   interval_minutes: number
   schedule_mode: ScheduleMode