Hello, I do not recall how to edit the logo in the mobile header. So I tried to go to Header Builder section but its empty. There are no buttons or anything to edit. Let’s start there. Login credential in private content.
Your issue has been solved. I have deactivated all the 3rd party plugins from the site and activated only theme-required plugins and now the Header builder is showing fine. Please activate the 3rd party plugins one by one and check which plugin created the issue for you.