Navbar not showing when viewed from mobile

Hello! This is my first time reaching out, and I don’t usually work with this, so I would really appreciate your help. Suddenly, the navbar stopped appearing when viewed from mobile devices. I’ve tried quite a bit on my own and looked through previous threads, but nothing seems to help. If anyone here can find the issue, it would be greatly appreciated.

Read-only link:

Here is my site Read-Only: LINK
(how to share your site Read-Only link)

Found the problem, Your navbar is displayed none when on smaller viewports, Just enable display flex or block and your good.

See image provided.

Also why 2 navbars inside of each other?

Thank you very much for your assistance! It solved the problem, and I also managed to ensure there is only one navbar for larger screens and a separate one for the mobile version.