I scored the first fight a draw.

The compubox stats in that fight are misleading. Many of Castillo's landed blows were light right hands that he threw when the fighters were in a clinch. While waiting for the ref to step in, Castillo would repeatedly hit Mayweather on the side. This is completely legal, but misleading. Since they were right hands, they count as power shots, when in reality they were no more damaging than a stiff jab.