I agree with you (even though you nicked my Gold on sunday you bugger!)

Maybe there should be a scorecard system as in golf, ie; both parties have to sign the card after the comp, the marker only signs it if he is happy with the scores entered on it

I have refused to sign golf cards because the player had suggested a different score than I knew to be true!

As you say, you mark their card as you see it and let them sort it out later if they say different