UC_AAC doesn't display the prices correctly (Quantity is not included in the calculation)

I am using UC for a site selling enveloping services = lettershop.

The products are mailings with default quantities mailing 250, mailing 500 or mailing 1000 etc... with a default value of 250, 500 respectively.

Customers can then use attributes to add additional things like a second page and other options etc....

I installed UC_AAC to dynamically display the prices but, when a customer is on the product page only the price for 1 product piece and it's attributes are shown. The Quantity field is completely ignored.

here is an example: http://drupal.msr-mailings.de/mailing-250