well the only reason why i think phonso was saying that is because, when the right leg comes back to the frame 1, the leg comes like directly and unsmooth back, means, add a frame between the last and the one befor the last, and make the leg go back abit smoother.
uhm i just want to make sure, did you animation in the right position? if you look up the esf animations, you see that the model goes down till the Pelvis joint is in the middle of the grid. I hope you dont have to redo all now >_<