I'd say this is the reason:
"The club that wins a clash receives a win bonus (+500 points) that is added to their score for the event. The High Score bonus (+100 points) goes to the club with the highest-scoring player, and is counted *before* the winner of a Clash is decided."
One of their players scored the most points which adds 100 bonus to their total making the score 332 - 287 in favor of the other guys.