No I was travelling on the 22nd.
it seems the system wasn't at fault when I reached the check in it seems NW had screwed up the reservation and it took about 20 mins and a call to AMS to sort it out, they had assigned a new e ticket number to the reservation which the KL system couldn't recognise.
Eventually got exit row 21.
I probably should have called the help desk again, but I had two long calls to NW and a waste of time speaking to the help desk and just couldn't be bothered