At least 26 Hamilton County voters cast two ballots in the November election, but no extra votes were actually counted.
Elections officials say they caught the double votes and are investigating why they happened. If voters intentionally cast more than one ballot, they will be referred to prosecutors for possible criminal prosecution.
In most cases, though, investigators believe the votes were cast in error. They say several ballots involved elderly people who sent in absentee ballots and later cast provisional ballots at their polling place.