Hi Emil!
This is Eugene from Unclutter Team.
Just found this thread.
Well, you guys right. It is not Alfred or system failure - it is about Unclutter.
We've fixed this issue in v2.1.5 (available on our website, will be also released soon in the MacAppStore and Setapp).
If you have a version from our website, please update and check if the issue is gone.
Wish you all the best!
Eugene.