Centerbox not showing up

[Siem]

For our new site, I'm trying to get one of the centerboxes to show up on the webshop page, www4. carmo .nl/index.php?main_page=index&cPath=4318&pg=categories
I can get the Featured Products centerbox to show, but the New Products and the Special Products centerboxes don't show themselves.
There are products in both of those lists, as can be seen on the homepage.

In Configuration -> Index Listing, the only options I have set on 0 are the show ... products on main page - errors and missing products page.
All other options dealing with showing new products are set on 4, featured products are set to 3, special products are 2 and new products are 1.

For new products, featured products and special products the number per row is 3.

Is there something I have overlooked in getting the Special products and New products centerboxes to show up?

[kobra]

the New Products and the Special Products centerboxes don't show themselves.
There are products in both of those lists, as can be seen on the homepage

I believe that the code only displays these on other pages when there are items that are in that category either new, featured or on special