Need help fixing parallax scroll

On the read-only page, I have a section with 2 columns (I only need this to work on Desktop), and each of those columns has 3 images (one on top of the other). I need to make it so that the in-panel scrolling stops after the 3rd image has scrolled into view.

Currently, the in-panel scrolling happens far beyond the required 3 image scroll.

Please help!

NOTE: On the read-only link, I’ve noticed that the scrolling only works after you exit the preview mode, and then re-enter preview mode. Must be a bug!

Here is my read-only link.


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