The media query for the hamburger button is max-width: 1366px, so you just met the cut off. I couldn't find a media query for the menu itself, but I suspect sin

The media query for the hamburger button is max-width: 1366px, so you just met the cut off. I couldn't find a media query for the menu itself, but I suspect since the hamburger button is what allows it to get created, they didn't feel the need.