Images to consider: gyazo.com/10879db50ee3b79881c7f70b7f4efccc gyazo.com/6d9db6b6285dccd625ccb9f124e8c3c7 gyazo.com/e472175216f282c0e676b7259a6bcda0 gyazo.com/3cc93991c0aaf61473ff4313ce73a6d6
The custom animations for the rig run fine, but the player is bobbing up and down for no reason! This does not happen if the hip height is 0 or less. However, he is completely submerged in the ground for reasons unknown. Only the torso and the head have "cancollide" set to true.
Sometimes adding a default BodyPosition in the player's torso helps the bouncing. Also, make sure if you're using the new physics that the model parts don't weight too much.