It's hard to say what it would be from your description. Can we assume that the option to delete it does not show up like it does for the other templates?
What does it say for Description? If it says "TWAIN" it will keep coming back because it is being generated by a TWAIN driver on a client PC in your network.
It is possible it is coming from another device through the template pool, if that is the case just change the IP of the pool to be an invalid one and it should clear upon a reboot. But be absolutely certain you do not have a Fiery print server attached to it first.
