Problem with my physics asset constraints

Hi, i’ve a physics asset with two capsules: one attached to the pelvis and the other attached to the thigh left.

The problem is when i start the simulation for only the thigh capsule, it move like this:

What should i do to prevent the capsule from moving?

Can you post a pic of that capsule’s constraints?

Those capsule’s constraints are default except i modify the swing 1motion and 2motion to locked and the twist motion to limited so the problem is maybe linked to the skeleton?

I find the solution: i use the button snap in the bar tool and it work but i don’t really understand why.

but when you move leg this situation still happen , for now ,I have to lock all angular,wait for the new solution.