error mesh with metarig (distortion)

Good morning everyone! I'm a beginner with Blender 2.8 and I have a doubt, I tried all the tutorials possible, but I couldn't solve it, so I thought someone could help me. Follows the error ...

I created the simple character, with some separate elements like bone, eyes and slippers. so I inserted Metarig. it worked ok but the slippers are distorting when i try to put my legs in another position. tried all online tutorials and nothing !. So I hope someone here can help me. I thank you for your attention.

I put some images with the slippers distorted and beside the context modifiers.