Many temporary files on my drive available and Cryptometer will not stopped after closing

I’m using the latest version but on my Windows PC (Version 10 Build 1903) I see a lot of .tmp files on my Cryptomator drive. If I’m stopping / closing the programm does not close the programm.
Only a reboot or killing the task will solving this issue. The ~WRD00
.tmp files are there after re-loging to the tool.

What’s happening?

Update Dokany.