Images in Gallery not displaying correctly

Hi,

As photographers, we use image galleries in a lot of blog posts. As of today, I've noticed the layout of these has gone awry. For example, in this blog post Where to Stay in Kauai the images below the headers "PRINCEVILLE VS POIPU QUICK COMPARISON" and "BEST AREA TO STAY IN KAUAI" should be displayed in a gallery.

Additionally, those under the heading "KAUAI SOUTH SHORE – POIPU" are not displaying in a gallery as expected. They should display with two portrait orientated images next to one another at the top, and one landscape orientation image below.

I'd appreciate any support on resolving this. Many thanks.