We play 9 holes currently.
Our averages are based on 18 holes.
Take your 9 hole score, multiply times 2.
That's your 18 hole average.
If you have a 70 average, it means you are averaging 35(1 under par) for 9 holes.
So, if you shoot par, which is 36, that equates to a 72 over 18 holes.
That's why your average went up.