I have no idea why the menu messes up everything only on those dimensions, to be precise from 768px to 979px width. The mobile menu button shows up but dont hide the regular menu. It also break the navbar-fixed-top option. How can I fix this?
You can check & compare the variables.less file on your site and it in default template package (you can download from download section of template). Before compiling less, remember to backup all CSS files first.