Hey EternalWalker,
Sorry for delay in response. There is a bug in our database that involves redirectors requiring two Fixups before they can be deleted and I thought that may have been what you were running into here, but it looks like this might be a separate bug. I will enter a new bug for folders remaining after deletion. In meantime, only way you’ll be able to remove folder will be to find it in Explorer and delete it manually. Just be sure that you’ve removed all references beforehand!
Best,