Divi Navigation Bar Malfunction (Menu invisible on page load / faulty behavior)

Hello everyone,

I need support with an issue regarding the default Divi navigation bar after setting up my website layout. The navigation is behaving incorrectly in terms of its visibility and fixing/sticky behavior.

The Problem:

• Upon initial load of any page (scroll position at the very top), the navigation bar is completely invisible.
• The menu only appears once you start scrolling down.
• If you scroll back to the very top, the navigation immediately disappears again.
• Important: The option "Hide Navigation Until Scroll" in the Theme Customizer is explicitly disabled/unchecked. However, Divi is acting as if this option were enabled.

Previous Workaround (not a permanent solution): To make the navigation visible upon page load at all, I enabled the "Fixed Navigation Bar" option in the Divi Theme Options.

• The undesired result: While the navigation is now visible when the page loads, it gets pushed up out of the screen when scrolling down (it behaves statically). It does not remain fixed at the top of the screen.

Desired Behavior: I would like to restore the default Divi behavior: The navigation bar should be permanently visible and fixed (sticky) at the top of the screen – both directly upon page load (at the absolute top of the page) and during the entire scrolling process.

Is there a known bug, a cache conflict, or a specific CSS approach to correct this behavior? Or did I miss something and didn't configure it correctly? Please note that I am a beginner and not very experienced yet.

Thank you very much for your help!