I know you are trying so hard so I have a tip for you.
Take one of the pattern sheets like you pictured and color in each square with the appropriate color, #1 red, #2 white, #3 green. Then compare it to your sewn square.I think you will see that you are not quite following the sequence correctly.
For example, #1 is red, #2 sits on top of red, #3 is green and should go from the top to the bottom on the right side. It should be covering the #2 white in the right corner and then all the way down to the bottom right corner of the red. Does this make sense? It would be so much easier to show you.
Notice that your paper pattern is a series of squares whereas your stitched block is not. You have a stairstep pattern going.
If you look just at # 1,2,3--they form a square, add # 4,5,6,7---you have a bigger square, and so on and so on until you finish with the final piece.