Firstly, you have played a bunch of 9 hole games, so you need 2 to make each 18 hole total. Secondly your average comes from a soft cap of games. Tour pro is like 30, Master 35 or 40 and Tour Master 40 or 50. So as long as you have not hit that cap, all your games count in your total which I believe is what you are seeing. Once you hit that, it will drop faster as each time you shoot a low score, the highest one will drop out of your average.