I think its because you’ve used the same download location for both radarr and qbit. Looking at the trash guide here,docker guide, if you look at the compose example you’ll notice that the download client, sabnzb in the example, has a separate download folder than radarrs. Fixing this should mean that you can also remove the remote path mapping, which in its current state has the same location for remote and local path, which conflicts with the practice described in this guide. But I think you shouldn’t need remote path mapping if you follow the docker guides folder layout.

Ffmpeg logs and maybe head to the jellyfin forums, there are a lot of helpful people there.