Here's what happened:

You made two bets of 0.04 BTC around the same time.  One way on "lessthan 32000" and the other was on "lessthan 48000".  They both won.  One won 0.05240186 BTC and the other won 0.07875280 BTC.

You're looking at the payment of the 0.05240186 BTC and asking why it isn't 0.07875280 BTC.

Here are details of the two bets you made:



To see them for yourself, click here and here.

You can see from the address that received the 0.05240186 that it is from the "lessthan 48000" bet.  If you scroll down a bit in the transactions list you should see the other payment.

I don't know if I can make it any clearer than this, but if you still don't understand, please let me know which bit you're not following, and I'll try to explain further.