Attach collision to socket issue

I have a skeletal mesh that uses the same skeleton as another mesh, and for this one I want to attach a collision to its arm, and even it shows in the right position in the editor and in the blueprint editor, when I play the collision is in the 0,0,0 point of the skeletal mesh. Am I doing something wrong? I have set my collision to overlap all dynamic.

Bump, see if anyone has any suggestions.