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Animated div in menu bar not working on all pages

I have a div that is supposed to move down behind the menu while scrolling. This works great on the home page… but I cannot get it to do the same thing on other pages…

Here is my public share link: *[

You can see on this page… most of the animation works, like the text changing color and the logo change from white to black… The only thing not behaving is the white div block… Any ideas?