Sorry my bad....I was reading 9XXXX instead of 9XXX when giving the answer for your CN...so, rectifying your CN is not high.....
And about the numbers on the corner : I don't know the right answer on this one but I think this may affect your case. Because, from what I've read, the CN must appear on every page of the form DS-230 in the top right or left corner.You really have to call KCC or an US embassy/consulate and clear this out.