looking at that ball joint above its not been fully seated and someone has battered in the pinch bolt anyway, assume ripping the threads clean off the pinch bolt so it will have been moving up and down in the hub, as above probably damaging the hub.
With the above fixed if there's still issues swap out the rear dampers. (i chased an issue years ago, leading to a full front end rebuild and it still wouldn't drive properly, couldn't get to the bottom of it until one of the rear dampers started knocking, changed the pair and the problem was completely solved!
