Marketpress Shipping Options

Hi there,

I have all my products loaded and have added specific flat rate options for delivery on each product. I have set the main store setting to flat rate = $0. The problem is that when my customers go to checkout it is adding up the shipping cost based on quantity rather then a flat rate. Ex. the delivery would be $75 up to quantity 18 (which is also set on the product) but when they start 5 cubic yard it is adding the shipping 5 time.
How can I change this?