Test:
Ride on a floating block while in creative mode and wait for it to hit the height limit. There's a chance that when the block breaks you will still be floating upwards.
Even after flying in creative mode or switching to survival mode you will continue to move up.

Okay removing setNoGravity causes more bugginess so I guess I'm gonna have to spend some time looking into this again later on.

removing setNoGravity and noPhysics fixed the issue!
Also fixed the issue where the screen shakes when you're going up on a floating block.

I'll have to remove the setGravity function probably.