paypal payments not sending info

[godin5150]

I use paypal on my zencart site and everything works fine except when orders are placed and paid for through paypal I receive payment from paypal and my site stores the customers sign up info however it does not send me back or store the order information. I'm basically having to email my customers and ask what they ordered. Anybody have any clue what the problem could be?
site: http://www.cowtownwebs.com

Thanks

[DrByte]

Your server probably is unable to receive or respond to PayPal's notices it's sending to your server to release the orders.

Troubleshooting: http://www.zen-cart.com/wiki/index.php/PayPal