Why do deleted Content Browser folders reappear?

thanks for your fast answer. I used Fixup many times, but it doesn’t help.

Example:

Folder named “Character”, I rename it to “Characters” and then i have two folders. One folder Character with empty sub-folders and one folder Characters with all assets. And if i want to delete Character folder UE4 thinks assets still exists in the “Character” folder and i can only delete it with force-delete. Then i save Content Browser and use Fixup. After that i can delete the “Character” folder. But when I restart editor Character folder with sub-folders reappear.
same happens if I move a folder to a different location.

(my project location: C:\GameDev\UnrealProjects )