So i download a video,i change metadata (Aritst/Title/Year/Etc) and then the torrent become red and not in seeding anymore
This doesn't happen with qBittorrent to me.

What OS? what version of Tixati?

are you changing the file through your computer and not through tixati?

different torrent clients handle things differently.

i think that just like if you changed the file name, outside of tixati, it is a different file to tixati.