I dont have the magazine, but somehow it doesn't seem off to me. I have a feeling, that their backing yardages are not for wide backing fabric, but for regular 42" wide fabric, and so the yardages would be the right amount for a 42" wide with a seam down the middle. Also for the batting, a lot of people buy their batting packaged instead of off of a roll, so maybe they mean buy a twin size package as compared to not buying queen sixe??? Just some ideas