I maintain the website referenced above. When the website is viewed on an ipad in portrait, I see the mobile “hamburger” menu, as normal. But when switched to “landscape”, the menus don’t display correctly. The drop-down behavior is the problem…they don’t collapse. So, when the user tries to open another drop down, the others remain open. Clicking on the menu in an attempt to “collapse” it, only results in an error. I don’t even know where to begin troubleshooting.
I based the site on the “Medical” demo, if that helps.