Ungroup erroneously merged versions?

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What type of library are you using? Also, your naming convention does not conform to documentation, so you may see odd behaviors as Jellyfin tries to interpret. If your folder(s) don't conform to the recommended naming scheme, that may be part of it as well. The "space, hyphen, space" naming you have, along with not following naming conventions, likely means that these files are interpreted as one version of the same episode/movie.

https://jellyfin.org/docs/general/server/media/shows/