7of9
Hi,
The issue may come from the language assignment of those menu items. If you check these items in the Hauptmenu, you're assigning it to GE language only.
If you're using GE language only, you can simply assign it to all.
In case you have other language also, you need to follow the steps of how to create a multilingual site in Joomla: https://docs.joomla.org/J3.x:Setup_a_Multilingual_Site in which you need to have a default menu, each menu for each language.
Regards