Featured collection not showing all items in Debut

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I'm trying to set up my site using the Debut theme. I have a manual collection of 17 items, that I'd like to set as the featured collection on the homepage. Even if I adjust the featured collection section to include 5 rows, with 4 products per row, the maximum number of items that will show in the featured collection section for me is 8. 

What causes this? and how I can I make sure that the full 17 items in the collection will show up in the featured collection section, as they should if I've selected 4 products per row, for 5 rows

Thank you!