navigation quirky using iPad as a platform

I am creating an extranet wordpress site, when you come back to me with a response I will share a URL an login for the site so you can see the issue I am having. When I view and use my site on an iPad the navigation bar is quirky. when I click on a menu item on the home menu, if the menu option has sub pages underneath it the menu expands and when I try to click on one of the sub pages, the screen select a link underneath that menu option. For instance if I am on the home page, the home menu option expands I try to select on of the categories but since it is hanging over the slider box it select the story in the slider box and not the menu item. I was wondering if it would help if I bought one of the paid themes that you offer (simple, responsive, pro) or if I can get the free version of your theme to work on the iPad platform. Can someone help me out with this issue I am having, thanks a lot - Michelle