Redoing a site in 2024 theme and header works fine, scales correctly until I activate Otter Blocks which was used in previous site pages. The header when plugin is activated maintains full width, dose not resize and drops down from the top of the page as well for some reason creating a gap at the top. Using a sticky header group.
I resolved this finally by finding several “o-” classes had been added to the advanced style tab. Prior finding the correct way to natively make the sticky header in the site editor, I had tried using Otter and it apparently added these classes which remained even though I removed the settings.