I am only a newbie quilter, however, I have been exploring drafting and designing quilts using graph paper and grids and all . . . That being said, please take this with a grain of salt - what size template did you down load from Quilt Block Pattern .com?
If you downloaded a 9 inch block in total, then the finished block nine patch equal components (squares) have to equal 1.5", which leads to the cut strip (or square) must equal 2.0" Two inches minus seam allowance of .25" is 1.5".
Does this make sense?
June