Hi Hiba, have you retouched your character artwork while rigging? One instance of these errors ocurred to me, when handles in rigging became orphanized because I moved artwork. Espcially Physics-handles like dangle do not feel well when becoming located outside of their "danging object" .
You also can force this error by dragging handls outside of your puppet, for example, a hand-move handle, that you move in front of your artwork because that ist how you would do it in 3d-programs. doesnt work well 🙂