@urx585 all new torrents are automatically deleted if the uploader fails to either:
a) seed to completion to at least one peer
b) actively seed the torrent for 48 hours
this doesn't mean the torrent will be immediatelly deleted after 48 hours, as there is a grace period of some sort. The uploader doesn't have to seed for 48 hours non-stop, they only need to accumulate 48 hours before this grace time deadline.
If a torrent becomes unregistered before this period, it is because the uploader has deleted it himself.