diff --git a/frigate/camera/activity_manager.py b/frigate/camera/activity_manager.py
index c2dfa891d..ec0c8546d 100644
--- a/frigate/camera/activity_manager.py
+++ b/frigate/camera/activity_manager.py
@@ -69,15 +69,26 @@ class CameraActivityManager:
 
         # run through every zone, getting a count of objects in that zone right now
         for zone, labels in self.all_zone_labels.items():
+            # Deduplicate objects by object_id before counting
+            # This ensures each unique object is only counted once even if it appears
+            # multiple times (e.g., with custom classifications)
+            zone_objects_by_id = {
+                obj["id"]: obj for obj in all_objects if zone in obj["current_zones"]
+            }
             all_zone_objects = Counter(
                 obj["label"].replace("-verified", "")
-                for obj in all_objects
-                if zone in obj["current_zones"]
+                for obj in zone_objects_by_id.values()
             )
-            active_zone_objects = Counter(
-                obj["label"].replace("-verified", "")
+
+            # Same deduplication for active objects
+            active_zone_objects_by_id = {
+                obj["id"]: obj
                 for obj in all_objects
                 if zone in obj["current_zones"] and not obj["stationary"]
+            }
+            active_zone_objects = Counter(
+                obj["label"].replace("-verified", "")
+                for obj in active_zone_objects_by_id.values()
             )
             any_changed = False
 
@@ -113,13 +124,21 @@ class CameraActivityManager:
     def compare_camera_activity(
         self, camera: str, new_activity: dict[str, Any]
     ) -> None:
+        # Deduplicate objects by object_id before counting
+        # This ensures each unique object is only counted once even if it appears
+        # multiple times (e.g., with custom classifications)
+        objects_by_id = {obj["id"]: obj for obj in new_activity}
         all_objects = Counter(
-            obj["label"].replace("-verified", "") for obj in new_activity
+            obj["label"].replace("-verified", "") for obj in objects_by_id.values()
         )
+
+        # Same deduplication for active objects
+        active_objects_by_id = {
+            obj["id"]: obj for obj in new_activity if not obj["stationary"]
+        }
         active_objects = Counter(
             obj["label"].replace("-verified", "")
-            for obj in new_activity
-            if not obj["stationary"]
+            for obj in active_objects_by_id.values()
         )
         any_changed = False