Someone explain the math to me please

I was 90 points going into a matchup and lost then the day after I go into a matchup and win and lo and behold i only reach 79 points and it was a gain of 18 so...ummm 90-X+18=79 that means in a single game I lost 29 points. so losing game 29 points winning game gets me 18 to me that math is unfair....
Report as:
Offensive Spam Harassment Incorrect Board