Continuing this thread in which the problem was confirmed, but not yet resolved:
The error seems to be from watch.plex.tv where episodes are out of order, like here is “Season 3” which is supposed to start with New York, but plex starts with Seville, which is actually s02e05. https://watch.plex.tv/show/travel-man-48-hours-in/season/3
No amount of changing the agents within plex seems to work, the only ordering Plex will ever show is the one from watch.plex.tv