PO bug

I dont really know what this is but this happens. In this instance I mean to send out meant to send out a different pokemon, but it sent out a blastoise with Leaf Storm, Sludge Bomb, Hidden Power, and Toxic spikes (A Roserade set from a Roserade on my).

Did you click a lead on the team preview section, then cancel it and change your lead before the match started? I did that, and the exact same thing happened to me. It's actually your Roserade, it just shows the Blastoise avatar for whatever reason.