Ignore most of that. I just realized the reason the grip looked weird was because you were not saying that they only see the grip - but see it regardless of which grip, as a pole grip.
I'd probably reinstall.. or try some of the save fixers - It might somehow be related to player position/rotation, So try Slipcor's Save fixer first - then try backing up save and attempting a new save or sandbox and see if items are still borked
If they are - try finding and deleting all the info and actually reinstalling with a fresh download