Problem description:

Not really sure what the problem actually is. My mobs all skip over any kind of observable movement and just appear in any spot they move to. If I set a client fps, I can see them moving but it's weirdly... sharp? If I set a world fps, it changes nothing unless I set a client fps first in which case it makes it so I yet again can't observe mob movement. I have no clue what's happening, not even sure where to begin. Just completely baffled.