Images suddenly full size ( or larger)

I’ve been working on this gallery, putting in some information for the captions, when suddenly the images in the gallery aren’t in the nice grid that they should be. I’ve looked at my captions and can’t see anything that would be affecting it.

The page is at http://www.kawarthaartsfestival.com/test/ You can see that from one image having the proper border etc, the next one is the right size and no border and it goes downhill from there.

https://wordpress.org/plugins/maxgalleria/