Something similar happened to me once, it was offline though and it stuck around for a minute before flying off. Think it's a known very annoying glitch that will most likely never get patched. Also 1.6 and about to go in again.
"That's not Selen. That's Ms Cleavage." Zyrax2301 PSN: thebiueninja/Fortenbras_DOOM Gamertag: the biue ninja