The navigation seems to work really well. However, I've noticed an issue which I can't seem to fix. When the page is loaded in desktop (over 768px) the drop-downs and sub-menus work well, then when I drag the browser to less than 768px so it switches to mobile view the sub-menus still work. But when I refresh the browser (under 768px) the sub-menus don't open. When a drag it to desktop and then back to mobile it works again. This only seems to be happening when the page is loaded in mobile size. This seems to be the case in Chrome, Safari and Firefox on the Mac.