CMS column overflowing on other side


I want to showcase my projects in a masonry grid type column, where the CMS items are placed in two adjacent columns but are uneven in heights based on the image height. I found a YouTube video to get me started but now you can see that the last CMS item on my left column is beginning to overflow into the right column. How could I fix this?

EDIT: For some reason, through the public share link the problem is even worse: most images don’t show at all! I don’t understand what is causing this, especially as on my designer at least the images are showing and I am viewing these from exactly the same display

Here is my public share link: LINK


I have decided to go with another solution that is a masonry grid script from Refokus, which seems to work more reliably than this column trick thing.