You couldnt have watched that game and though the refs came into the game to call that game fairly....
Rule 14.2 of the PlayNRL rule book states:
Any offside player who remains within ten metres of an opponent who is set to catch a kick up field by an opposing player shall be deemed to be interfering with or attempting to interfere with the catcher and shall be penalised unless the non-offending team gains an immediate advantage.