After the update of X and Cornerstone my menu in mobile devices is down. Loading the webpage in a mobile phone the front page is okay, but touching de the menu and clicking one of the child pages the layout ( stack Ethos) is gone. The webpage shows fine in Desktop and iPad.
The first image shows the normal correct layout of the front page, the second shows when clicking a child page within the menu.
I can’t figure it out what is wrong, so I hope you can help me out.