I had the same problem once ... in CoT Strat some DK rolling for the tanking cloak and he was there as dps (tanking was his off-spec) and the cloak was better than my cloak at that time (I'm a prot pally).

And not just that - when I was farming for the heroic CoT Strat shield, I had once a ret pally (former prot - those ppl that respec to lvl) in my group that said he would roll for the shield if it dropped ... I spent the whole run almost praying for the shield not to drop - and it didn't, thank God.

I just wish some ppl wouldn't come w/ the "X was my spec, I respecced for lvling" when it comes to loot because they have to remember that if they wanted to run the instance, they needed a tank and a healer, so loot priority isn't for your current off-spec if the tank/healer of the run still need the particular weapon/gear, I don't care if you were tanking/healing BT before WoTLK. I lvled as prot and I know ppl that lvled as holy/resto spec, so I know that wouldn't be fair to all of us if we had to compete w/ dpser's off-spec set.