Mesh does the mesh deform when I move a bone

Question

Why does my mesh not deform correctly when I move a bone?

Before rotating:

After rotating:

Here is the file (please don't use it/publish it and claim it as yours)

Answer 1

This problem occurs due to your last bottom child bone. You can solve this in weight painting mode. You just select top bone of leg and you see no color with white / blue/ yellow / red to your right leg mesh. just try to select bottom bone of left leg and see right leg shoe has some white color. So remove that white color in weight painting mode. solve problem.

** Edited ** First change your blend from subtract to mix i left brush panel show in first image.

then in second image you can see different color circle. In this you can see painted and not painted mesh by selecting bone with same color. Now You can easily paint your mesh and remove painted mesh with just increase and decrease weight from 0 to 1 in left brush panel.