mob starts doing backflips when walking animation ends

so, i made this "chest mimic" monster for my mod, but the mimic for some reason will "do a backflip" when its walking animation ends, by this i mean that when it starts (and stops) moving it does this strange behavior of rotating, i changed many things about the model to try and fix this but it just.. didnt work
i dont have a video yet but heres the basic gist :
mobs idle looks normal, then it walks and it jerks upwards a bit, then when its done walking it does a full 180 rotation as if its backflipping (and some of its limbs look weird when its doing this)
ill update this with a video later