It appears that while improving the tracker so that there are less timeouts received at the torrent clients announces, a glitch prevented the system to log the (first) seeding started. Which then lead to the "not seeding" messages sent out and later automated deleting. :afr:
The different messages to the Helpdesk and this topic helped to become aware of the issue, than you.
Please understand that when such question first drops in, before there are multiple in a short period, the usual standard cause is addressed in the reply. In your case it wasn't a standard answer, because the moderator did look into the log to see it was deleted for not seeded after 3 days.
Certainly a lot of torrents got deleted and even more "not seeding" messages sent out wrongly. Sorry!
The issue has been fixed.