Parallax Zoom Bugged

Hello. I created an interaction on the homepage of this site on which several at images in layers scale at different rates making it look as if the user is entering the forest. It works perfectly when the site first loads and looks great.

However, when you scroll about 75% of the page and then go back up, the interaction stops working and images are cut. Any ideas on how to fix this?

Thank you.

Here is my public share link: LINK
(how to access public share link)