I know you marked this as SOLVED, however I just noticed (dunno how I missed it before) that your umask is 022 for qBittorrent but it is 002 for Radar. Even though you have the same UID/GID on both systems I’d still recommend setting 002 umask in the qBittorrent compose file

What do the permissions look like on newly created files and directories from the qBittorrent container? Run ls -al and check to see, this sounds like a simple fix.

You can try adding file_mode and dir_mode to your fstab mount as well.

https://superuser.com/questions/1359092/whats-the-difference-between-file-mode-dir-mode-and-gid-when-mounting-a-cif