games in the NBA (and im sure other leagues around the world aswell) have around 80 rebounds a game
I'd suppose that 50+ Rebounds per match refer to the rebounds each team catches which makes 100+ per match.
That might indeed be a lot more than the average in the NBA but as this game is a simulation of basketball in total and not of the NBA, I don't know the number of rebounds you'd see e.g. in a third division in Mexiko.
We have both said a lot of things that you are going to regret.