lisette You found the answer yourself, but just didn't see it. In this tester, if you look on the standard draft you'll see that the shoulder width line is further from center than the mid-arm width line. You do have a measurement error. Your mid-arm width can't be wider than your shoulders. Your shoulder points will always be wider, even if it is just a small amount. Go into this measurement set and edit it paying attention to the images provided for the two measurements and you'll see what I'm talking about.
The front and back armhole will not be the same length. If someone told you that they are mistaken. On a super simple draft, sometimes the same armhole will be used for front and back, but these would be loose fitted garments most likely constructed from knit fabric.
