Not seing the navbar when i go on the preview

Hi guys,
I’ve created the navbar and it look good on the designer but when i go to the preview modo the navbar disappears.
Can someone explain?

The only read link: Webflow - Nenad Tatarski site

An here the site published on web:

Hi Marco, you can delete the “Section Hero” from your Navbar, it’s an empty div.

Thank you mate! i’ve solved the problem,