You know I discovered a similar problem last nite. I was piecing a top that was "supposed" to fit a twin bed using the guide that my LQS gives out. Low and behold I now have a top big enough to fit my full size bed - and that's without borders!!!! Upon closer inspection I found that all the measurements for twin, full, and queen sizes were all one off - I have been using the guide for weeks :( I have so much extra fabric I won't need to buy any for months. Clever ploy or simple mistake???