Clear cheating in the game

I played a training match against some Iranian dude 111 rated ok I won the game overall 5-1, but the goal I conceded was apparently to a player called Bryce so I went into the dudes lineup and he doesn't even have a player under that name , and I did this as soon as the game had ended so he can't have sold his player that quick so explain sublinet how exactly did I concede?
Bryce is still in his squad today.