bones act like chewing gum on payment

new man low res.041.png.blend (1.46 MB)I left Blender for a while and do not remember how to take care of this problem. I have a bone that when it is rotated or moved does not move some of the mesh completely, some of it is stuck on the floor like a chewing gum on payment, I new a remedy but forgotten it.

here is the image I was talking about

Your foot bones have no parent!?