I have problem with some torrents. I'm seeding about 800 torrent, and about 30 have this problem. The tracker url in .torrent file is correct (with passkey), but after adding into Transmission, the passkey is removed. I delete that torrent, readd and the problem persists.
Clarification: I add the torrent with the web interface, or Transmission Remote GUI/dotnet, all 3 have problem. Transmission is installed on my NAS.
I'm not sure what could be causing that. I don't suppose you could mail me one of those original .torrent files so that I can try to reproduce the problem -- after changing some of the passcode's characters, of course...
New remark: I deleted 1/2 of my torrents (4xx instead of 8xx), that fixed for most torrents. Now, sometimes I have a few torrents whose tracker is without passkey, but it is not persistent, when I looked at them later, their tracker was update with passkey.