Root Motion Anim Ok in Persona not in game

I have an animation with root motion where the character falls to the ground and then gets up.

It all runs and looks ok in the animation editor when I run with root motion however when in game it is all jerky and does not run the same as in the editor.

I run it from a montage similarly to many other montages I have working ok (including root motion anims).

Any ideas as to cause and possible fixes to try?