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Sticky working no well

I follow this guy’s tutorial exactly, but when I scroll down, it works fine, but then I scroll up the content stick together and sometimes disappear.

pls help

Here is my public share link: https://preview.webflow.com/preview/may-profile?utm_medium=preview_link&utm_source=dashboard&utm_content=may-profile&preview=2470d508db4f8cb9d4a555f47e8aa871&mode=preview