Navbar Resize Issue on Tablet/Mobile: Need Help with Fix

Hello! I'm hoping someone can peek at how we setup this navbar. We tend to use NavBar 1 often, and sometimes we get this issue where the navbar menu doesn't fill the top part of the screen on tablet/mobile. We've come up with a workaround using some custom code, but I'm convinced we could fix it with positioning or z-index? I'm sure we are missing something simple. Here is link to the site: https://preview.webflow.com/preview/ocean-vibe-dental?utm_medium=preview_link&utm_sour[…]0d0a3d0f54&pageId=68d6ccdc1f1137a67f99e2f7&workflow=preview