Beautiful but not iPhone friendly

The theme is really nice and smooth and everything is just really good, BUT the submenus don’t open on my iPhone, except of the first one.

I tried the theme on two different sites, once completely without changing anything and once with lightly customized CSS.

While I am on my desktop PC I can click all menus in their mobile versions to open the submenu, but as soon as I use any iPhone 5 I got available in this household, only the first menu opens the submenu points but the 2nd and 3rd doesn’t open.

How can I fix this? I don’t mind applying the CSS or PHP code myself. I don’t wanna update, cos this would make my CSS changes disappear. Already tried version 1.5, which got released today! No changes unfortunately ??