SOLVED: Preview Pictures & Titles showing something completely different!

[TheDreadPirate]

What could be the reason for this misidentification? Is it generally not recommend to structure your extensive media library (shows and movie) through A-Z sub directories?

I completely missed this the first time.  Do not nest movie folders.  That is 100% not supported and almost certainly the cause of the misidentification.  Jellyfin uses the folder names as part of the identification process.  If the folder with the movie is nested it will use all the folders in the path to construct the query.

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

Code:

Movies
└── Best_Movie_Ever (2019)
    ├── Best_Movie_Ever (2019) - 1080P.mp4
    ├── Best_Movie_Ever (2019) - 720P.mp4
    ├── Best_Movie_Ever (2019) - Directors Cut.mp4
    ├── behind the scenes
    │  ├── Making of the Best Movie Ever.mp4
    │  └── Finding the right score.mp4
    ├── interviews
    │  └── Interview with the Director.mp4
    └── extras
        └── Home recreation.mp4