diff --git a/backend/apps/dashboards/models.py b/backend/apps/dashboards/models.py
index 926f4f28..5a6e7fa7 100644
--- a/backend/apps/dashboards/models.py
+++ b/backend/apps/dashboards/models.py
@@ -40,6 +40,8 @@ class BrowserCardPosition(BaseModel):
     spawned_by: Optional[str] = None
     # When the agent leaves the deliverable on the page (a video playing, a page to read), it sets this so the frontend's auto-close on parent finish skips the card and the browser stays put.
     keep_open: bool = False
+    # The dashboard this card calls home. Persisted so the home survives a save; without it the card reloads untagged and renders on EVERY dashboard (the cross-dashboard bleed).
+    dashboard_id: Optional[str] = None
 
 
 class NotePosition(BaseModel):
diff --git a/frontend/src/shared/state/dashboardLayoutSlice.ts b/frontend/src/shared/state/dashboardLayoutSlice.ts
index 77661a7b..7c9afecf 100644
--- a/frontend/src/shared/state/dashboardLayoutSlice.ts
+++ b/frontend/src/shared/state/dashboardLayoutSlice.ts
@@ -1344,8 +1344,9 @@ const dashboardLayoutSlice = createSlice({
           // Merge, don't replace: the keep-alive browser cards resetLayout preserved are ALREADY in state.browserCards with their webContents live. Keep them and add this dashboard's saved cards on top; on overlap (switching back to their own dashboard) the live data wins so the mounted webview isn't disturbed.
           const keptAlive = state.browserCards;
           const incoming = action.payload.browserCards;
+          // Default a missing home to the dashboard we're loading (legacy/untagged cards), but DON'T overwrite a real persisted home: a card saved here yet owned elsewhere is leftover from the old untagged-shows-everywhere bug, leaving its true home lets it park off-screen and get cleaned on the next save instead of bleeding.
           for (const card of Object.values(incoming)) {
-            card.dashboard_id = ownerDashboardId;
+            if (!card.dashboard_id) card.dashboard_id = ownerDashboardId;
           }
           // New cards boot parked (no guest process, title placeholder); the suspend hook wakes viewport-sized and agent-driven ones on its first pass. NEVER re-park a live keep-alive card, that snapshot-swap would kill its session.
           for (const id of Object.keys(incoming)) {