UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.139 Safari/537.36

Steps to reproduce the problem:
1. Visit https://codepen.io/throttleup/pen/KRmLwL
2. Note upon clicking the first image "hi" is alerted
3. Clicking on any in subsequent columns does not trigger the "alert"

What is the expected behavior?
I would expect all images to trigger the mouse event

What went wrong?
The event did not fire

Did this work before? N/A 

Chrome version: 66.0.3359.139  Channel: stable
OS Version: OS X 10.13.2
Flash Version: 

I am fairly sure that this worked on 65, though I'm having trouble reproducing it in any versions on browserstack. Very strange, because I can reproduce it on multiple machines natively without issue.