How does TN make these animations and think "yup, that's great. Ship it out"?
They're most likely using a blending anim system. the anims were probably done at a slower frame rate and the system speeds them up causing some glitches in the blending. I've seen some crazy stuff in other fighting games, like pause Chun-li in SF4 when doing crouching MP. Her arm bends at 5 different places.