I have e Gen 3 female the is just fine exept for her shoe. The front of sitcks to the ground and stays there, whele the r4st of it moves. The whole shoe is painted red. So 100% wetght all over the whole mesh for the foot IK. Happens on both feet. Also in Motionbuilder.
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You almost certainly have some weight applied to another bone, maybe the root bone, if we can’t see the blend file we cannot tell.