Jettamax:
I have a ? why does my avg go up even though I am shooting under par .....
The average is based on a certain number of ranked games (50 in TM) within a tier. If you are new to the tier you can have fluctuations in the average, If you shoot a few low scores early in that tier, then a round of 2 under will push your average up. For example if you shoot 60 first game, then a 70, the average will go from 60 after the first game to 65. The more ranked games you play the less dramatic the variance.
However as the system has now changed Match Play wins against a higher tier will drop your average as has happened with the OP.