I would guess it caught the release group, rather than the movie name, I have had a few files that come down as tgony-immotal.mp4 for example.
Setup:
HTPC: Acer Revo 3610 (openELEC 3.0.2) with Aeon Nox (4)
NAS: unRAID 5rc12a on an Intel 3GHz Core2Duo with 4GB of RAM and 5 2TB WD EARS Green Drives
Running: SickBeard, CouchPotato v2, Headphones, Maraschino, Plex and SimplePlugins