Why is Joplin locking a random folder?

I was trying to uninstall ROCCAT SWARM (keyboard software), and I couldn't delete the folder because it said it's in use/locked by a process.

Checking in Resource Monitor I found that Joplin is the process keeping that folder locked.

Why is Joplin using/keeping active that folder?
I thought that the only folder Joplin is using is C:\Users%USERNAME%.config\joplin-desktop

Probably this keyboard does something weird, like taking over other processes. That should be fixed with a reboot