Hi,
Like David, I also don’t see this issue on my end.
I have ezoic ads installed, but its currently set to “off” so the ads are not displaying. Perhaps this is it?
It could be the case where that mentioned plugin is inserting empty DOM elements for ads between the content and the header. Empty DOM elements with set height can look like a “spacing” issue.
But we can’t really be sure about it.
I’ve checked your site’s page source and I didn’t see anything being inserted between the header and the page content.