Find my device show me JUST A CASE of my AirPods!

A month ago, I bought a AirPods 4, is not a first time when I use AirPods( have 4). One week ago I lost left pod, and the app find my device don't show me where is my pod! I think my AirPods is not original! IT'S ok when my app show me just where is my case and always with tougher AirPods inside???????