Mine done this aswell, buggy as fuck. Turned gladius on and was sorted. It bugs sometimes and shows your current arena enemy specs as the previous team were.
I've been playing with Blizz UI ever since Cataclysm launch. Don't recall having bugs like this, it's been working just fine for me. Used to run with 289347234897 addons/mods till realised it's stupid and useless. You can make Blizz UI amazing with a script or two.
Yeah thats what i was thinking but i have had bugs like that its just i havent bothered to get the picture, and for the bug i blame Manaki, Hes been skipping dragonslaying lessons !