After respecing to Ret for a weekend of PvP madness, I forgot to swap max rank Consecrate back in place of Rank 1.
I ended up tanking Magtheridon, Doom Lord Kazzak, and Gruul using Rank 1 Consecrate. Surprisingly, we won Mag/Gruul with minimal deaths. DLK went and ate a Druid (at this point I was like what the hell is going on), and we abandoned doing him, since it was during Thanksgiving weekend and we were already short handed.
I didn't end up figuring out the odd threat anomaly until after we had finished raiding, regardless of the Druid pulling aggro. I finally realized what happened when I went to ZA later that evening as Holy. I went to drop Consecrate on a snake trap, and low and behold, lolz 17 damage ticks.
Goes to show how much I pay attention to what I'm hitting for while I'm tanking. But at least that lesson made it so I'm sure I recheck to make sure I'm using max rank everytime I respec, lol.