I was going to ask if the quilt had to be one specific size for any reason. But I see that the center border is squares. So, you can adjust the size using the first (most inside) white border. Are you sure you've adjusted th size of the quilt so that the squares will come out evenly? You can always place the squares border along side the inner white border, and if it doesn't fit quite right, make a few seams between the squares a little smaller, too.