Jellyfin doesn't display favourites properly

[kandykarter]

I'm a little lost; apologies if none of this is relevant.

When adding stuff to your favourites, do you use the "Add to favourites" option directly available from a movie/show's content menu?

Not sure, but I believe that option adds the movie etc. to Kodi's internal list of favourites. If you want to add something to your Jellyfin server's list of favourites, you need to select "Jellyfin options" first and use the favourites option from there.

To see what's been marked as a favourite on your Jellyfin server using Jellyfin for Kodi, you need to go to the Add-ons section of the Kodi homepage, select the Jellyfin addon under Video add-ons and use the Favorite options there.

No, I'm marking them as favorites in Jellyfin-web, and I have a Kodi widget that points to Jellyfin's favorites. If I go to a movie's page in Jellyfin, and click the "heart" icon, it doesn't necessarily show up in the favorites dialog in Jellyfin. Sometimes it does, sometimes it doesn't.

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Not in my case. In my case, going to the actual favourites behaves as I described above. There are currently 4 of my current 16 'eligible' movies showing.
https://imgur.com/a/LapNvlw

I don't know this screenshot as on all clients I've tried (Web interface, JMP, Android TV, Android, iPhone) the Favourites page doesn't look like in your screenshot.

I use Jellyfin For Kodi for most of my watching on the TV, which I have set up to show a list of all the Favourites on its home page. There, it shows that I've got 15-20 movies marked as favourite, where if I log onto Jellyfin, it only shows two.

So, you can see the favourites in Kodi but not with any other Jellyfin client?

Correct. But if I look at those individual movies IN JELLYFIN, they show as "favourite" by the red heart icon, they just don't show up on the favorites page IN JELLYFIN. The fact that Kodi still displayed them was the tipoff to the problem, as I'd noticed things seemed to be vanishing from Favorites, and now it looks like they're not being un-favorited, but just not showing up on the page for some reason..