Items in cart are different than what's bought

Hello guys

I am having an odd problem with my site https://buyrealsocialmarketing.com. When someone goes to buy anything from my site the cart displays 1 certain product 100 USA FB Fans. Go ahead and try to order something for a test. It will always come back to this.

I need this resolved ASAP as its crippling my site. Any suggestions anyone?
i have marketpress version 3.0.0.6

I am scared to upgrade to the new one because I have custom CSS and afraid I will have to start from scratch.

Thanks