Hi there. I've set up the menu on Studio theme but the 2nd level sub-menu doesn't display

On the 'About Us' dropdown menu, hover over 'Our Partners' and you'll see a gap between the 1st level dropdown and the 2nd level dropdown. Because of the gap, the menu closes when you try to reach the 2nd level menu.

It doesn't appear to happen on either the 'Home' page or the 'News' page but it seems to be a problem on every other page.

Any ideas as to how this can be resolved?

Kindest regards,

Steve Bimpson