That happens even you have restarted Cinema 4D and while you are in a new scene?
Have you tried to delete the preferences (Cinema 4D.prf), you find this file when you go to the Preferences [Cmd-e] and there in the lower left corner is a button to get to the specific folder. Restart. If things stay the same, contact the support:
Perhaps two more options to consider:
I can certainly look into it, if you share a small scene that has this problem.
If a new scene can’t show that problem, copy all the content from the Object Manager into a new scene (set the Project settings first if they are not in the standard way).
All the best