I caught a Natu the other night; but when I hit the first ‘OK’ afterwards, instead of seeing a Natu stats popup screen, I saw a Wailmer!
I wasn’t upset, since I’m still chasing Wailmer candies in pursuit of a good Wailord. As the days have passed, though, I find myself more perplexed by it. If something like it happens again, I might consider filing a bug report. I’m just curious whether anybody else noticed anything like that.