problem with how photos show after WordPress update

My website was working fine until the most recent WordPress update. Currently, any place where I have a gallery, and there is more than 25 photos, the first 25 photos show, then there are arrows to the next 25, etc. But when you click on an arrow, the photos don’t show, and if I try to click again, all of the first 25 photos are no longer showing at all. It used to be I could just scroll through the photos. The galleries are within NextGen which also recently did an update so I don’t know where the problem originated. It is not only happening on this page, but all of my pages where there are more than 25 photos.

The page I need help with: [log in to see the link]