How to cope with 2 navigations on mobile

Hey Guys,

since I wasnt able to create one navigation with 3 levels, I decided to work with several navigation menues in this website.

You can see what I mean if you click on “Kommunion” for example…you´ll see that a second navigation in pink appears:

My problem now is, that that solution does not seem to work on mobile.
Although I activate the “menu icon” in the settings of this second navigation, there is no menu icon or “burger menu” seen on the mobile and tablet view. So this navigation is not seen on mobile and its sites can not be accessed.

Is there any way to make that happen?
Or is there any “more userfriendly” way for example ONE navigation with three levels?

Thx in advance