Very fair comment ... out of your 100 questions, maybe 2 or 3 have proven to be flaky. Why post corrections on this site - it's unfair to all those of your entrants who have no access. Just void the erroneous and score everyone out of maybe 97 or whatever - much fairer.
I post as a strict neutral, having neither seen nor entered your quiz. However, good luck in your fund raising venture anyway.
J