To fix this issue, just go to Appearance > Editor > style.css and search for the following CSS:
Save your changes, refresh your site and this should resolve the issue. Bonus Tip: Notice the content: '/4c' value in the CSS above? This is also where you can change the icon. For example, if you'd rather use a down arrow (similar to our Anthem theme), replace '\4c' with '3'. For a full list of icons available in the ETmodules set, click here.