I need help
It’s not any of my scripts because they were working in a different model, the hip height of the humanoid is right, and the model is rigged properly. Ive ran out of ideas on what’s causing this issue. The only thing I could think of now is the animation but I don’t know how that could change anything
wow that looks creepy
can you please tell me you what you are trying to achieve with this humanoid?
It’s supposed to be crawling lol. I think it is the animation since it works when I changed the animation to a normal walking animation. I guess I will play around with the animation a little
sorry to say this but i’m not very good at custom rigging/character joints and stuff
But I can say that Terrain has huge role to do with how the character moves on it
I suggest trying it on a flat surface and maybe get an idea from it
Dont give up on your goals 
I think the larger the model the worse the movement on uneven ground
Edit: I figured out its the pathfinding that doesn’t like the uneven terrain. If I just used Humanoid:MoveTo() it wouldn’t try to avoid objects, but it wouldn’t freak out. I used the smooth tool on my terrain and it helped quite a bit. (Im like 90% sure about all of this)