Can't delete temporary folders in inbox

Hello,

A few weeks ago, I renamed my folders in my inbox. I have pretty extensive folder management, meaning that I have about 10 main folders with (partly) over 50 subfolders for each main folder. A few weeks ago, I renamed a few of the main folders and then about 20 temporary folders were created. Some of them I can delete, some of them I cannot delete. The ones I delete then show up again. Has anyone else had this issue?

Thanks.