Armature problem

I’ve added armature to some parts of my last project…with some strange results. It works fine everywhere except i this spot and I can’t find the problem. The mesh doesn’t follow the armature correctly but instead warps and distorts. Anyone familiar with the problem?

are the bones lined up with the mesh? Check in edit mode.

Found it. I had assigned the top ball to another group aswell by mistake. Thanx for the help anyway man :smiley: