Shipping costs twice

Hi there!

I have installed a shop with WooCommerce and WooCommerce Germanized. I have two kind of assets: asset A and asset B. They have different shipping costs: A has lower shipping costs than B. The settings are: When a customer will buy both, A and B, he has to pay only one shipping costs, even the higher shipping costs (in this case the shipping costs of B).
But in the shopping cart the customer sees still both shipping costs as option buttons, he can choose between these two shipping costs, although they have the same price?! This is very vexing for the customer.
Is there a possibility to show only the higher shipping cost? Where can I do that?
Thank you!