I've tried crouching and then standing, sprinting while crouching, siting/using an interactive object (alchemy table, bench, forge ETC..), loading a previous save (glitch was still present in my earliest save), sheathing my weapon while crouching, holding the sprint button and crouching a bunch of times.

It really ruined my time off.

I'm not too keen on deleting and re-downloading the whole game.

Any ideas?

Mods? Have you tried a game cache verify? DOes this occur in a new game?

"1 file failed to validate and will be re-acquired."

I'll see if that fixed it.