Only some images showing in gallery

I’m having an issue with a gallery since the latest update. http://ladybugproducts.net/gallery/

There are several additional images in the gallery that are not showing up on the gallery page. I’ve deleted the gallery and rebuilt it but to no avail.

Is it possible that my images are in different files and the gallery can only pull from one of them? I am afraid to move them around as they are attached in different places throughout the site.

Any suggestions as to what might be happening here?
Thanks!