When you click REMOVE it just eliminates the torrent data from Tixati's cache.
Technically speaking any external .torrent files are irrelevant to Tixati. It keeps all that info in the internal .dat database files.
When you click remove and DELETE< it also deletes the downloaded DATA from the transfer.
So if you don't want orphaned data, be sure to click R & D. And as the issue which started this thread be sure the setting for "DELETE LOCAL FILES" is enabled :)