Hello,
Sticky nav works fine on desktop, on tablet and below when body is scrolled up and then back down (hiding and revealing the nav) first click on the hamburger does nothing but the second click opens the menu and the third click closes it.
So everything works fine from the second click, multiple times, unless the nav is closed and the page is scrolled again. Then again it requires a first click to kind of “bring the button to life”
Thank you so much for your help 
Here is my public share link: Webflow - New Build