There may be a better solution out there, but I prefer to use a media manager, such as TinyMediaManager, to grab the info for my media. You can choose your preferred provider, in your case IMDB, and then have it write .nfo files for your media, which Jellyfin will grab its info from.
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This is not entirely uncommon due to versioning. The network TV version might have aired in a different order from the later released DVD boxset, or the US version aired in a different order than the EU version, etc. Instead of refreshing metadata, try using the Identify option. Under each of the results it will show the source, so pick the one that matches the episode order you want.
That did the trick, thank you!
TMDB has multiple sort orders available. In jellyfin, edit the series metadata and change the "Display order" to DVD and it should match the IMDB order.