The judges really shouldn't be able to tell what the keel is made of, I doubt that was a factor. Most likely it was something about the way it rode the water. I checked it pretty good and thought it sat on the water pretty nice, would have liked the tail just a touch lower, but it was within an 1/8 ". It did rock a little when the kids were moving around in the pool, I didn't think it was any worse than some of the low head birds, but who knows, it may have taken a funny roll when they were looking at it.