I don't know if its intentionally there or not but the animation should stop when you exit the gear menu to avoid getting to some nasty situation as you cannot aim with the animation on and you have to press shoot or any of the move buttons to stop it.
- Legacy ID
Access gear, exit gear, the animation keeps running
After 2 years the same problem is still there. I think it would be logical that your character would stop his "checking of the inventory"- animation the very moment you close the inventory window instead of having to give a separate command to stop the animation.