County officials say the error caused only one side of the ballot to print.
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Officials say this impacts 16,000 general election mail-in ballots.
NPC, the company who prints the ballots noticed the error, CEO Chip Gallaher said:
"We sincerely regret that this happened and are working with the County and State to ensure impacted voters receive a new ballot. Once the error was recognized, we immediately stopped production and began to investigate. Our investigation determined that a programming error caused the back page of the ballot to be omitted."
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Montgomery County is asking anyone who receives the faulty ballot to return the ballot and envelopes.
Officials say new mail-in ballots will be re-issued automatically and expected to be mailed by next week.