Hi, hard to say without the link of the page to inspect what element is causing the problem.

But you can at least check if you have ever forgot about a min-width on an element of your page or on the header reusable element.

And no need to add 100% max-width. By default an element will take all the width it can if no limit to its max width or “fit to content” checked.

Feel free to DM with a preview link if you want me to look further into your problem.