Now i have made some more test. I have 3 menu items with sub menus in - "OSX Server", "Galleri" and "Test Parent". they are all different set up and none works on my iOS device.
First one OSX server is a page and the sub menus are categories put in as sub menus.
Galleri is a page and the sub menu "test side" is a page.
"Test Parent" menu is a ling i have put in and after that cleared the url so the menu it self don't have a link. The sub here "test child" is a page.
None of these works on the iOS device...
What i have seen is that when a menu is shown on iOS devices, you had to click menu items twice. like first click is to choose and second is to go.. not sure how else to explain it
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