Those are very likely Hook Sync files. It looks like you turned Hook Sync on:
Sync Tab – Hook Preferences pane.
and selected the ~/Documents/Hook folder, which is not where we would recommend you put the sync files.
Normally users create a folder in iCloud, Dropbox or an external SSD for them.
See also: https://hookproductivity.com/help/more/using-hook-on-multiple-macs
I recommend you turn off Hook sync, and delete those files. Then if you want to sync, please create a folder specifically for Sync.
Looks like we should add some code to ensure the Hook file sync does not overlap with non-sync Hook files.