Hello Darren,
Thanks for discovering this flaw in the theme. We will pass this on to our developers for review. In the meantime, you can add this snippet of code in the CSS editor as follows:
.entry-title { z-index: 0; }
This will move the site title behind the dropdown list.
Alternatively, when editing the page, you can deselect “Display page title” in the editor window under the page title field. That will hide the title of the page and skip straight to the content.