Mobile dropdown menu: click on parent link closes the menu; should expose child

Hi, I'm very happy with this theme, but I have an issue with the mobile menu: To reproduce: 1) On mobile, scroll past the hero on the homepage or go to a category page 2) Click on a parent link Expected: Shows child menu items Actual: Closes the menu I noticed that when I first come to the site on mobile and click the menu without scrolling, the parent works fine. But once I scroll down and click the menu, clicking the parent adds a "focus" class. Is it possible that something about this class is closing the menu altogether? Http://www.emilyanaymark.com/author Thank you