Menu issues

Hi Guys,
I have added some sub-pages (child) to the main menu and they behave fine when first opening the site. However once you click on them (as tiled down) you are then unable to access them again – the menu only displays the top page link. You have to click back on the Home link (presentation page) which seems to reset them. Not sure if I am having a caching issue that is creating this problem or if it is a known bug with the theme? I have presently added some text links to the main pages (eg. shop) so users can navigate quickly to the other child menu drop down items.

Can you provide some advice please? I have set up a custom menu for the main menu and separate menu for footer and mobile view. By the way – love the theme!

Thanks, RB.