"All Tracked Shows Watched"

Tonight my tracker has started displaying "All Tracked Shows Watched".  If I switch to "show watched shows" and then back to "hide watched shows" it fixes the problem but refreshing the page brings it back.  Oddly, it seems to be correlated to "mobile" mode (ie it happens when the window is very narrow but not when it's a normal size).  It also seems to be somewhat inconsistent as occasionally a refresh brings back my unwatched episodes but a subsequent refresh will cause them to vanish again.