Thank you for the response! So it it only with parallax title pages and blog posts that this creates an error with?

This is for all where the Unyson visual page editor is used.

Also, how can I add a theme header.php file to my file editor? I attached a screenshot of what i’m currently seeing, but I want to add custom code to the header and in between the body for Google Tag Manager/tracking.

You can,’t add it from default theme editor. You have to do it using FTP or cPanel file manager of your site.