Lead Developer
The per-page settings won’t work for the same reason they don’t work for the blog index when it’s set to a page – WordPress ignores all metabox entries for these post types that are using the index.php template.
When you’re using a shortcode to display your content, the metabox values will work, but when it’s the plugin applying the functionality to the page, they won’t.
Unfortunately it’s just a WordPress thing at this point.
Let me know if you need more info 🙂