Moving items between "Current Iteration" and "Backlog" and they don't stay moved

I’ve moved a bunch of stories (which were originally moved from another backlog, if that matters) from the “Current Iteration” column to the “Backlog” column (we’re not working on them yet) and it seems to work, but then I come back later and all the stories I moved are back in “Current Iteration”.

I’ve never “caught” LiteTracker in the act of moving them back, no screenshot or video would capture it; just when I flip back to my Safari window with LiteTracker in it the stories have moved back. There are other people observing the backlog, but they’re not moving things around (they say.)