Hello,

Thank you very much for choosing our theme and for contacting us.

Most likely you have set different headers for different pages. You need to set one and the same header or set “None” in page settings: https://xtemos.com/docs/woodmart/header-builder/set-different-header-specific-page/

Please check the Theme Settings > Product page and check the option to set the header for the product page and make sure there is the proper header is chosen.

Best Regards