if it is the pattern I am thinking it is, I made it as well. the seams that meet in the center, after you have made the halves, do indeed have a smaller seam. you have to pay attenetion when you are putting the side sections together. I believe it is just the one row that is not symetrical. I turned one the wrong way and since I had triple seamed it, I did not rip. Once it was ragged it was hard to find the mistakes.