Well, it’s not exactly clipping, I just don’t know what else to call it. I’ve rigged these legs, but when I move them, something in the shoes stays stuck to the ground and creates a weird shape. I can’t find out what it is.
Here’s my file:
https://drive.google.com/file/d/1SsPNsXb5a-UVwYLsvzBNgc4xSuflPZnE/view?usp=sharing
Thank you in advance 
You need to weight those vertices. The only reason everything else in the shoe is moving is because they have holdover weights from a different, earlier attempt, that happened to share some but not all bone names. Those stuck vertices have no deforming weights. Even parenting with autoweights will be fine here.
Yes, I reapplied the automatic weights and the shape is gone! Thanks a million!
