I cut my strips 2-1/2" wof, than I put strips together as noted in instructions. But when I sew my nine patch I get height 6-1/2" but my width is only 6". I checked all my seams and they are exactly 1/4". And yes when I cut off the sewn together strips in 2-1/2" pieces. I only put one block together and have the others cut and ready to sew for 9 patches. Do I need to cut all over again. Need help please as what to do?