Ah, they added an auto collections feature? That’s neat. If it’s like the plug-in that Jellyfin has to pull from TMDB’s collections you should be able to edit the collection and choose other posters then. So the poster being different than yours doesn’t mean necessarily the method used to get it is any different.
But this really doesn’t help brian with his issue regardless.
@brian_s242 Images in Plex can be changed where one client has them still and another is not able to see them. See this post I made about actor images disappearing. The actor image was still visible on the web, but not on the FireOS client. Try changing the collection poster (saving changes) and then going back to the one you want, so it gets reapplied to the collection.
You might need to clear cache on Kodi so the poster has to be re-fetched from the server to the client.
