I have re-designed a client's home page for his business website. It has one mobile variant - sized for cell phones. The menu (hamburger) drops down, shows the menu items, and even changes colors when an item is tapped on, but for iPhones it does not take the site visitor to the page tapped. The menu works fine on android devices. Everything also works fine on a desktop as well. Any suggestions on why or how to make it work for iPhones? TIA