Why can't I see all featured products after clicking the 'see all' button?

On the website I only want 4 to show, under the features products. Then click see all button to see rest of stock- however it brings me to a blank page and you can’t see the rest of the products. I know I can add up to 25, but I don’t want that many on the main page.

ive tried many numbers in those 2 sections but it’s changes the on the website. So I have it how I want to look now, but It’s not working.

even under collections you can’t “see all” when you click the link