ok so i've been sewing blankets... one side is fleece and one side is flannelette. I pin the fabric and sew.. however when i get to the end of the side i always end up with more fleece than flannel... which.. in the end... really messes up the blanket.. it keep accumulating until i am done sewing... i turn it inside out and sew up the openeing but am left with more fleece than flannel... WHY??? HELP