So I mainly play Mini Walls and UHC Champions. I have a good amount of coin boosters and i use them occasionally. The other day I played a mini walls game, which i had about 8 kills, and 4 final kills, and won, i was rewarded roughly 1,350 coins. I decided to turn on a 2x booster and i played another game, this time with 10 kills, 4 final kills, and a win as well, but only received 930 or so coins. Please explain how that works.