Buy Button for Collection product order

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Can someone help me understand how the order of the products displayed for a "Buy Button" that is for an entire collection?  It shows beautifully on my test site, but I can't figure out how the product order is being determined.  It's not alphabetical, it's not by price, it isn't by the order I added the products, I can't figure it out.  And no matter how it is determined, is there a way for me to control the order of the products?