Coins that disappear

I would like to know why my coin total keeps dropping even tho I win games. I have noticed over the past couple of weeks that my total drops when I win. It seems if you make the mistake of buying coins to play you can never get ahead. You lose a game and your coin count drops. You win a game and your coin count drops. Seems like a scam to me.

Wolfhound 1 about 8 Ball Pool™, v3.8.5