I'm new to Shopify and have a question about the 'Buy X, Get Y' discount. Why is it that when I have a rule called '3 for 2,' and I add, for example, 4 products to the cart, I end up with 3 order lines in the cart? There's 1 free product, 2 products at the normal price, and then an additional line with 1 product at the normal price. I understand that 2 of the products fall within the discount and the last one does not, but I don't find this very user-friendly. Is it possible to change this so that there are just 2 order lines?