@willywonder
What a funny coincidence…
When I saw your fix I thought to myself: “Weird, that is the exact same thing I did in my CSS, including the comment…”
After asking this question I played around with the CSS and found the fix myself. I noticed that Carolien had the same issue here (https://femfotos.nl/2014/01/14/carolien-2/) so I decided to comment there first. I’ve been meaning to mention the fix here as well, but you beat me to it. Thanks!
For those interested. The above CSS is what fixed the issue for me. It centers the image, although it doesn’t show the two side images. One other difference is the images don’t slide into view.