Coupon Confusing in cart

Hi.

The Coupon I created is for 15% off $30 or more. If a user clicks the magic coupon link, then views a product, the price displays as discounted. If the product price is less then $30, a warning is displayed that the coupon is for $30 or more. If a user then views the cart page, the coupon is not attached to the order. If they then increase a quantity of products already in the cart to meet the $30 or more coupon requirement and selects Update Cart, they still get the error that the cart total doesn’t meet the requirements of the coupon. If a user plays around with the quantity and updates their cart a few times, it will eventually be applied correctly.

The page I need help with: [log in to see the link]