Highend 2.0 update problems – Mobile Menu

Hi, I updated to the new ‘photography’ header. Every thing great except I cannot get the mobile navigation menu link to drop down when phone is in ‘portrait’position (works in landscape position). When phone is in ‘portrait’ position you can see the 3 line drop down menu link but you cannot get it to drop down and use it, so cannot navigate from this position. Thanks!