Reply To: White space up to the header after refresh the page.

Hello,

Try to enable the “Separate cache for mobile devices”: https://prnt.sc/ZoclZQZowd5X , then clear the site/browser cache.

I suggest you adjust the WP Rocket as described in our article: https://xtemos.com/wordpress-performance-optimization-the-ultimate-guide-in-2021/#Step_4

Kind Regards