This issue is being forwarded to our Theme Developers and They will check it closely.
BTW, there are many Plugins who can generate Responsive Menus for Small Devices. This Plugin is a popular one. You can also control the Menu Designs editing the CSS from responsive.css file.
<meta name=”viewport” content=”width=device-width” /> These are actually Plugins Territory. We need to follow the WP Theme Review guidelines strictly to get approval of our Themes for WordPress Repository. You will find the same
<meta name=”viewport” content=”width=device-width” />
code for the WordPress default Themes.