I tried to look up if there's a thread for this before.
But the bug I'm talking about concerns that 15min period before game when you can't change your tactics for the game. During that 15min period on your manage my team page shows if you have won your cup game.
It shows like this before the 15min period and while after when game has started this:
Total cash reserves: $ 53 329
And during that 15min period if you win the game it has added the price money:
Total cash reserves: $ 353 329
So if your game starts 16:30 you can see between 16:15-16:30 if you're going to win your cup game when your total cash reserves has already added price money.