Tatabox (phat name BTW),
I had one X, and my GPA/AMCAS grade didn't change from what I input. When I called them they didn't say what happened. Don't worry, though, b/c when I verified my grades at Loyola they were what they should have been (meaning AMCAS transmitted the correct stuff). I don't know if you can extrapolate this one X to your situation, but it seems that what you see on the printout of your app is the real deal. Hope this helps!
Neil