mberwing
Hi
The template Home menu item does not use Component section to display the mainbody content like articles.
It only display the modules. In Joomla if an article or its category not assigned to a menu item it will open under homepage. As your homepage does not have the Mainbody it not showing.
Kindly create a menu item for those articles category, like category blog type menu and assign the article category to it : 177-interkulturelles-internationales
So when you click on the article under this category it will not open under Homepage and open under the menu item you created.
Regards