(Portland, OR) -- Multnomah County Elections is vowing to make changes after 93-hundred ballots were missing a measure from Metro in the May Primary election. The correct ballots were mailed to voters, before the election deadline. A review found the problem occurred during updates for the redistricting process. Elections is adding steps to check the validity and reliability of its source data and will double check all ballots for the November General Election include the correct districts.