Old Skier
Tour Winner
If you say your score is X, your marker would say, no your score was Y. Both would discuss it, agree, then the marker puts Y on the card.
You then put your scores in computer, so hopefully you have already agreed the scores the marker put on the card. If you make an error when entering on the computer, at least the committee have the card to cross check. This should at least be done for those in the prizes I'd imagine.
If you were left to simply mark your own card, you would have just put X, and no one would be any the wiser.
Your assumption is that the marker is correct. If 50% of players (I find that a very high figure) are getting it wrong then logic suggests that 50% of markers could be getting it wrong and your wrong, if I still insist that my score was X then the marker can’t make up his own mind what to place on the card.