Top nav Menu not working on ipad

Hi all, hoping someone can help with this annoying issue I am having when viewing my website https://www.dontlettheforexdriveyouupthewall.com on my ipad, all works fine on PC, Mac and android phone.
The problem seems to be on the top nav. Menu,the left hand side of my menu bar wont work, so the home, about, contact and glossary buttons are not working. However if I refresh the page I can select them but have to refresh each time to be able to get them to work. All the other menu tabs to the right hand side work fine.
I did update my ipad to iOS 7 recently and this may be the reason but with little knowledge and this my first website I’m stumped. Really need to get this sorted, even considering changing theme but I don’t really want to do this.
If anyone has any suggestions I would be very grateful for the help.