Check to see if IK is turned on for the SHOES. I've run into this with things I run through Wardrobe Wizard... sometimes IK gets turned on for the clothing item, and it produces results like those you describe.

It would sure be nice if SM would give us the ability to turn IK off for EVERYTHING globally. It's a great idea for animators, but a pain-in-the-rear for the rest of use.

Hmmm... What about it, Ratscloset???? :)  :)