IPAD4 can't open links

I've made a website (www.computerhulpkingma.nl) with Catch Everest Free theme. Most devices (computer, android, WP7.5) can open the links in the dropdown-menu. Only my IPAD cannot. For example: When I opened a link in explorer, in the adress-bar the link is showed as: http://www.computerhulpkingma.nl/?page_id=4 When I opened a link on Ipad (safari or chrome), the link is showed as: http:/?page_id=4 I hope there is a simply explenation for it.