I found a bug in the ScrapBook styles, and it appears to be the Core layer.
If you have an index page that has galleries on multiple pages, and then you select to sort by most recently updated (i.e. ?sort=recent), it magically thinks there is only one page. For example, both Smoove and Framed don't hold all of my galleries on one page, and the bug appears when using both styles.
I played a bit, and it looks like the problem is that it thinks that $.sorted_pages.all_subitems_displayed is true even when it's not. This only happens with ?sort=recent though.
Let me know if you need any more info about this. :)