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A four-year-old software glitch wiped out almost 200 votes from a small California county’s November elections tally, causing officials to certify results that are now known to be incorrect.

The bug, which resides in specific versions of tabulation software sold by Premier Election Solutions, caused 197 paper ballots to mysteriously vanish from Humboldt County’s final vote count. The error only came to light after a volunteer outfit using open-source software and an off-the-shelf paper scanner audited the results.