It has been fixed, it looks like you have some custom styles which overwrite mobile CSS styles, I've added the following CSS rules in Nexus app to fix it:

html #bx-toolbar-content {
    display:none !important;
}
html .cd-side-nav, 
html .bx-sliding-menu, .bx-sliding-menu-main 
{
    top:0 !important;
}