Strange DEVONthink Behavior upon Launch

Recently, every time I launch DEVONthink, an export group shows up in the inbox. I have not changed any settings. The newly created groups are empty.

Any ideas as to what may be causing this and how to solve it?

Is there anything in the folder ~/Library/Application Support/DEVONthink 3/Inbox?

Yes, it is there. Should I remove it? I have no idea why.

Yes, just remove it as the stuff inside this folder is imported automatically (but not created by DEVONthink).

Thank you! this solved it!