When flying in gamemode 1, fist moves over

Your fist moves over when flying downward in gamemode 1.

What I expected to happen was...:
I was going to fly down normally

What actually happened was...:
I was flying down and noticed my fist moved over

Steps to Reproduce:
1. Fly or teleport up
2. ...hold down shift to fly downwards (dont have anything in your hand)
3. ...your fist will move over