Ranked Choice Voting (sometimes called Contingency Voting) is exceedingly complicated for both voters and election officials. In this system, not only do officials “count” ballots, they are reponsible for recasting votes on behalf of voters in the automated instant runoffs.
From Honest Elections Project: “Because RCV elections are so complex, identifying mistakes is far more difficult. The residents of Oakland, California are witnessing this first hand. Officials failed to properly tabulate RCV ballots, and even worse, did not discover their mistake until after the results were certified—and after the wrong candidate in a school board race was declared the winner. Now, the real winner is suing to be recognized.”