[thaumasiotes]

For a related issue, Kim Possible was aired out of order, leading to various problems if you watch the episodes in the order they were aired. I am given to understand this is fairly common for older TV shows.

Jellyfin has major problems dealing with this common situation. To Jellyfin, the source of truth is imdb. Imdb numbers Kim Possible episodes in the order they were aired. If you want the metadata that jellyfin scrapes from imdb, and you also want to watch the episodes in an appropriate order, you have to do this:

1. Number all of the episodes in airing order.

2. Ask Jellyfin to fetch the metadata.

3. Renumber the episodes into the correct order.

4. Remember never to ask Jellyfin to scan any directory that contains those episodes again.

If you mess up, Jellyfin will attach descriptions and preview images to every file that aren't, technically, related to the episode in that file.

[rebeccaskinner]

Jellyfin will let you set up alternate metadata providers and select between different episode ordering if available (https://forum.jellyfin.org/t-resolved-dvd-order-instead-of-a...). For tv shows especially TVDB will tend to have alternate orderings most often, and TMDB will occasionally have alternate orderings available.

[bigstrat2003]

That isn't a Jellyfin thing, Plex has the same issue. And both Jellyfin and Plex give you mechanisms to resolve that issue (using the alternate episode ordering that the metadata provider has, rather than the default one, or using another metadata provider if need be).