When the Google Checkout button is clicked from the products page, the shipping cost is always 0.00.

However, when the Google Checkout button is clicked from the CART page, the correct shipping cost is sent to Google.

The code for the button on both pages are the same piece of code.

What can be the cause of the product page sending the wrong information? What can I do to get the right shipping price sent to Google from the products page?

We use per unit perweight shipping method.