It looks, from what I can see in the photos - as if the straps have ripped out of the top of the door, distorting the lip it locates in, at the edge of the door. Normally, the straps are meant to slide into position along the lip, then fix onto the rotating spindle. Could you disconnect the strap from the spindle, the locate the straps at an undamaged place along the lip of the door?
The idea is for the straps to go 'over centre', so as to jam, or lock the door closed. I would guess that the cause of the problem, being that the door wound itself too far 'over centre', ripping the straps off the door? In which case, the closed limit needs some adjustment.