Secondary Menu is empty

Hello, since last week (I think since the last update of Catch Kathmandu) my secondary menu isn't shown anymore. I see the bar, but there are no entries in it and nothing happens if I click on the bar (the bar is empty). Even if I say, that another menu should be shown in the secondary menu, it still stays empty. And if I say, that the items of the secondary menu should be shown in the first menu -> nothing happens. The first menu stays with the origin elements. Any idea? Website: www.heidi-macht-fit.de Thanks in advance Daniel