Everyone has made mistakes on a quilt. I was leading a mystery quilt and when sewing the subsections together got part upside down so instead of the pattern aiming toward the middle one of the 4 sides was aiming out to the edge. Did not see when sewing, when ironing, when making the back, when going to the longarm quilter, etc. A friend said something as I was sewing the last of the border on. I now take a photo of the top before quilting to check for layout errors.