How is this possible?
Thanks, Oleg. And have a nice evening.
So far I have no good ideas on how to overcome this. Offline Explorer makes the menu links working, except the submenu one.
I also tried PageNest - it also didn't work well with that menu. However the saved page goes online when clicking the Startseite link. Of course, the online version works correctly - maybe this is why you had an impression of the working page?