how to fix foot bone in blender Ask

I am animating yoga poses and the motion is captured by Kinect, i dont have joints data for feet fingers so when a person stands on his feet his hip root translate upward and but mhx2 model does not recognize that and the model itself raises above from the surface, how do we fix! i am attaching pictures of two frames one is an initial frame where person just standing and another is where he try to stand on his feet fingers and raise itself upward but here the model is raising itself above.