Happens occasionally and we'll ask the second person to change their score. But if we don't catch it this is how I deal with it since it's not forbidden in the rules. If two have the closest score prediction to win, we take the first and second place points and split them in half, i.e., 2.5 points each. Or they get the second best score prediction, 2nd & 3rd place points (2+1)/2=1.5 points each. Or the third place score prediction, 0.5 point each.
If you like, propose a rule change/addition and we vote on it.