In my experience those issues have been present for years. This is a weird fix, but it usually seems to work: 1. Take the problem modules out of the rack and set them off to the side. 2. Put the modules back where you want them, but make sure the last thing they overlap before placing them is another module in that same row. If you overlap a module in a different row just before setting the module in place, it'll sometimes kick one of them out or be misplaced upon a page refresh.
-- Chace
That does work! Thanks for the tip.