####The reviewer is right!
If you compare your current theme with the default navigation menu from bootstrap (See Navbar Template for Bootstrap) - Try to access the link from a mobile phone or from your computer by resizing the browser to smaller width;
Basically your items needs to be in list; but because this needs to be a premium theme try to improve the default bootstrap styling. Now it looks more like an unfinished nav menu.
####See some approved themes
Open few approved themes in your mobile phone and see how the nav should look like . Then step forward and improve the menu from your template.
All the best