Gallery slideshow not working

Hi everybody,

I haven’t created a post in a while but my site is pretty simple so I didn’t expect much difficulty. Alas, when I create a new gallery the lightbox won’t switch to slideshow mode. What I mean is that when I click on a thumbnail the image doesn’t automatically open in a subwindow and when I click on it again it no longer scrolls to the next image in the gallery. In fact if I select the first image, images from my library not in that gallery are displayed under the selected one. What’s going on with this?

This is just one of several problems I ran into with my recent posts but this is the biggest issue.

I am running zero plugins and have cleared my cache.

Thanks

https://www.benjaminhoy.com to see what I mean. The first two posts are my newest and not functioning correctly. The other posts seem fine.