Help with Mixed Cart of Downloads and Shipping Products

[aperfecthost]

I have setup a site for a customer. it is at: hannapublications.com/store/
They have downloadable products and shipped products. They charge shipping by how much is spent on SHIPPED goods and does not take into consideration the downloadable products. I have setup the products themselves to have 0 weight and then put the weight in the attribute. ie., product 1 has 3 attributes, 1 is downloadable file and other 2 are shipped. (book or CD) The download attribute has 0 weight. The other two attributes have weight. When the table rate shows the pounds in the cart, the pounds of product is ok. However the shipping cost is calculated based on the total cost, not the weight. If the only thing ordered is download, there is no shipping charged, so that's working correctly.

Please help! I've tried everything I can think of, I've rechecked my products to ensure they are setup like that. What am I missing.

I have setup table rate shipping as follows:

Enable Table Method
True

Shipping Table
24:5.95,99:20%,100000:15%

Table Method
weight

Handling Fee
0

Handling Per Order or Per Box
Order

Tax Class
--none--

Tax Basis
Shipping

Shipping Zone
--none--

Sort Order
0

[aperfecthost]

Just noticed that it works correctly with most of my products and attributes. The products it's not working with is the products and attributes using the add-on "Product Attribute Grid".