>What possible mechanism could cause that? As a pure hypothetical, definitely not saying it's what happened in this case: if the wheel's bias is based on where

>What possible mechanism could cause that? As a pure hypothetical, definitely not saying it's what happened in this case: if the wheel's bias is based on where the ball is initially dropped in, and a human operator is the one that chooses where to drop in the ball, it's possible that the operator does something simple like choosing a spot opposite the number that last won the round and that this human bias affected the result in some way.