I think the problem is with revolution joints. Looks like you need to remove all joints before disabling Physics on pendulums object.
Also, Colludium is right - you should avoid changing angle or position of pendulums when physics is enabled! This applies to Drag and Drop behavior too.
So if you want to do this properly, "On Drag start" you should remove joints and disable Physics.
"On Touched Release button" re-enable physics and re-create the joint.
Another option - delete Drag&Drop behavior and drag the "pendulums" using impulses or forces.
Like in that demo I made for your previous post: