Hi brandonalpert – in all cases where Sela’s mobile menu became non-functional on someone’s site, there was either a conflicting plugin discovered, or the user had made edits to the theme that damaged the menu code.
Have you made any edits to the theme files or added any custom CSS? If so, reinstall a fresh copy of the theme via FTP and undo any custom CSS you’ve added. You can then add back any tweaks bit by bit – using a child theme or custom CSS plugin this time – to find the culprit.
If you haven’t touched the theme files or added any custom CSS, you can try temporarily deactivating all your plugins. Does the problem persist? If the problem is gone, reactivate your plugins one-by-one, look at the site in between each reactivation, to find the conflict.