Jellyfin Only Showing One Movie at a Time

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Are you able to play any of your media? Do you have the correct permissions set on all of the media (r+x on media directories, media itself can be ro)?

Probably need logs from the server itself to look at what weirdness is going on. If the server can actually see the media, it should display it, which indicates it likely can't see the media. If you can play the media you're unable to see, that makes it weirder.