Services not being charged properly

I have 4 services listed, each with incremental prices of 10, 20, 30 and 40 dollars. Product page is here
http://207.58.128.41/~dalegolf/store/products/appointment/

You can select the service you want at the top, choose the timeslot and add to cart.

The issue is that the services are not being charged in the cart properly. 4 players, should be $40. 3 players should be $30..etc.

Where is this edited to fix?