Custom Header not showing in Posts

Hi, Im a newbie to WordPress and have enjoyed the process of building my website with the help of Elementor pro. I am having trouble getting my custom header to show in my Posts. it seems to work in preview mode, but when I view it after logging out, the header does not show. There is a blank space where the header should be. It displays correctly for the Pages.

Thanks in advance!

The page I need help with: [log in to see the link]