The only ones I had seen offhand were in China.  I stopped it before it caused any further damage. Again, they weren't dragged.  I created the nodes in JOSM.  It seems that node IDs may have been duplicated.  It's the only explanation I can guess.  As for the ways that cross highways, this was still a work in progress that I was cleaning up, but I halted the upload when I saw the stretched nodes.
