I hope you are well today and thank you for your question.
Please edit the header and disable the sticky header option as shown in the attached screenshot.
Also, please remove the custom CSS code If you are using any on your website.
Have you removed the custom CSS code?
Would you mind if I log in to your site and do quick troubleshooting? If this is ok then could you please temporarily create an admin user account and share the account login details privately by adding them in the box having text “Enter your private content here (only you and forum moderators will be able to see it)”?
Also how do i change the logo on the AMP part?