So here is what is happening. I'm doing manual saves to avoid the quicksave/autosave issues until that gets figured out. My first save is #1, the second #2, and so on. Up to a point, anyway! After save #9, the game called the next save #5 again. Then the one after that was also called #5, then #6, and up to #9. At which point, the next went back to #5 again, all the way to #10 this time. But my next save, the latest, is #5 again.
It's not overwriting the saves and the newest is at the top of the list (other then the confused autosave thing), but it is very weird to have four save #5's already.
Not causing any problems that I can see, but weird.