Multiple Tab-Sections on the same page

Hi all

I would like to include two tabs with 3 tab-pages each at two different locations on the same page. My problem is the following: I would like the content of the first tab-page at tab one and the content of the first tab-page at tab two to be displayed per default. However right now only the content of tab two is displayed, while the content of tab one is not visible. Only when clicking on the tab one button, the content displays. Unfortunately the content of tab two disappears when clicking on the button of tab one.

http://www.grad-hunting.com/wordpress/unser-angebot/kosten-nutzen-optimierung/

I would appreciate your help.

Ruben