I am not sure what’s the problem as it works on all browsers for me. I guess there might be some plugin/theme conflict. Can you share your website url so that I can check and let you know what’s the issue.
I’m having the same issue as well. Tried disabling all plugins and removing the responsive-menu.js via FTP and still will not fire on the desktop. Not a huge deal, but it’s a shame for it not to work if someone resizes the window down to 800 pixels or so on the desktop.