opengl – Incorrect bone deformations using assimp

Hi, I'm trying to animate a skin mesh in my game using assimp and OpenGL.

This question is a follow up to this:
Strange OpenGL Mesh when animating Assimp

But I am having difficulty transforming bonés in the right way.

This is how it looks when I encourage the bones …

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The way I am doing the transformations is incorrect, but I can't understand it.
Can you help