Navigation bar disappeared

So I was just designing the website when I noticed that my header disappeared all of a sudden, I tried to go to Customize > Appearance > Header to have it try and show up but it didn’t work.
I tried to rewind to see if I can get it back and it seemed to work for a second before it disappeared again. It’s like the navigation is still there it’s just not visible or working for some reason.

• This topic was modified 3 years, 4 months ago by Jan Dembowski. Reason: Moved to Fixing WordPress, this is not a Requests and Feedback topic

The page I need help with: [log in to see the link]