Hello Ben,
Thank you for the credentials. There’s no known issues. We at Theme.co strictly follows the standards impose by WordPress. We have been using minimum requirements that you need to run WordPress and if there is an upgrade, we do upgrade. When I visited your site, it’s fine except that the menu is going down. This is because you have too many links and the space is not enough to display all of them. Please go to Appearance > Customize > Header > Navbar Top Link Spacing (px): Adjusr from 10 to 8. If would be better if you could regroup the menu links to lessen the number of main menu links.
Hope this helps.