When sorting numeric titles, Plex appears to sort by ASCII rather than doing a true numeric sort. This called attention to itself when I set sort names for Star Trek movies to Star Trek 1 through Star Trek 12. What I got was 11 and 12 positioned between 1 and 2. To get it to appear correct I had to relabel all the single digit numbers to 01, 02, 03, etc. It also happens that something like "2001 Space Odyssey" sorts before "28 Days Later".