Problem Identifying Bleach

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Yup. Are your anime in a separate library? If so, you should deactivate the metadata providers you don't want to use. Because I use an external program, my experience isn't exactly the same, but I know from past experience that unchecking the incorrect metadata DBs will provide you with the correct information.

Most folks who use Jellyfin exclusively to identify media and gather metadata for anime utilize anime-centric DBs and disable the others. If you want a single series, find the DB that lists the series this way, disable the others at the library level, and refresh the series with the replace all metadata option. I know that TVDB correctly identifies Bleach as a single series, but anime providers might do this as well.