While playing a match play, on second sudden death hole, the green #2 on St Andrews, slowed to a slow green. It still showed Very fast, like it was set the whole 18. But it slowed way down. a 15 ft put with meter moved to 13/14 only went 7 feet, same with other player, then the 7 foot putt with meter set to 6 only went 3 feet. Three putted from 15 feet, whats up with that?? And no it was a straigt flat putt, and I dinged it.