Hello @Blake,
I have logged in to your site and I figured out the issue. Your header is empty because you have created a custom header and assigned it to multiple page. The problem is that your custom header is empty which is why it is not showing any header contents at all.
Custom Headers:

Your custom header:

To resolve your issue, please edit your custom headers and add some more elements like bar, container and other elements, unassigned the header or you can totally delete the custom header instead.
Hope this helps. Please let us know how it goes.