Question about Physics assets

Hi, I have a question regarding the constraints in UE4 Phat. One of my bones is always “jumping up” in simulation, and no matter how I set up or rotate the constraint I can’t help it. I have set up an identical bone to this one on the other side of the body, so I doubt it has something to do with the skeleton.

I noticed there are gizmos on the constrains in the constraint mode. What do these gizmos symbolize?