Wix Editor Header options broken?

Hello. I’m building a Wix site off of a template, and I’m running into trouble with my header.

I’ve selected “Fixed” multiple times in “Settings” for the Header Scroll.

However, when I scroll, the background of the header disappears, leaving the text of my header to scroll over the rest of my website.

The Header “Design” appears to be a separate column from the text, and I’m not able to get into the HTML, CSS or JS to change the code.

Any ideas?

Is there a way to report broken functionality in the editor to Wix? The help center is a nightmare AI loop.