Usually casting two ballots in an election is against the law. Usually.
If you are a Permanant Absentee Voter in Long Beach you would have received two ballots. One for the primary and the other for the runnoff municipal election to be held the same day. And if you get confused and return them in the wrong envelope your vote doesn’t count.
If you go to the polls, you will find two ballot boxes, two sign in tables, doulbe the poll workers and two different voting systems. (The county uses the ink spot method while the city uses a fill in the circle method.) See article here.
Voting for high school student body officers is less confusing. Government efficency at its’ best.