Hey I've been playing Skyrim on the PC and when I first started I had been using both a two-handed sword and a bow. So here is what happened... Both the two handed sword and bow were in my favorites list, when I got sick of my bow I decided to sell it and the arrows but when I sold them the quiver would not disappear. I tried sleeping, waiting, going in and out of my house, saving and re-loading and nothing worked. I then decided to buy steel arrows. When I did and tried equipping them the quiver finally disappeared and I was able to get rid of the arrows and the animation bug. I hope this helps anyone having the same problem.
-I added background information to the problem such as they were both in my favorites list because I don't know if different things and actions affect this bug.
-Originally was gonna post to see if anyone else was having this problem but now that I found a simple fix I hope I could help other people out.