For some reason, the gallery is closing in the middle of the list of posts.
You can see it here: http://saynotsweetanne.com/printables-paper-crafts-downloads/
I've tried using IDs instead of slugs, setting the #shown to 10000, using pagination, everything I can think of in the short code.
It appears </div> is being inserted in the middle of one of the entries, which closes the wrapper and leaves the rest of the thumbs just hanging out.
Any thoughts on what this might be?