Skeletal Mesh is broken when I change it runtime

GIF of the issue: Screen Recording 2020-07-23 at 11.59.47 ÖS

Hello, I am trying to change my skeletal mesh runtime, but when I use “Set Skeletal Mesh” it gets broken.

I have 3 parts of body, connected to “set master pose component”

Changing mesh via editor works but not in runtime

Any help?