I thought I went crazy, but apparently not. It was a bit hectic, but I had drawn ewer and then used it on myself, but the buff was then nowhere to be found. It was just in a 4 man so then I cycled through the party and no one had it, so I didn't accidentally use it on someone else although I was already positive I wasn't targeting anyone. I had deselected the tank and then used it as it should default to me normally. I don't think anyone else had used a buff on me at the time. I was with a DRK, BLM and DRG.