Bugged Inspector of game objects

58099-n0gkknv.png

Why is this happening?
How can I fix it?

P.S. I know I can continue like this but my experience screams that it most likely hides future inspector or in general editor bugs.

In my case it was custom editor for all GameObjects that spoiled everything:

[CustomEditor(typeof(GameObject), true)]

Changing it to something like this helped:

[CustomEditor(typeof(Transform), true)]