Surprise, surprise, surprise! The electronic voting equipment from the company formerly known as Diebold has been the subject of repeated reports of issues related to reliability and glitches in recording and counting votes. These machines continue to be in widespread use. Quoting from the above article:
Officials in Butler County, Ohio -- north of Cincinnati -- were the first
to raise the issue when 150 votes from a card dropped in March. Brunner's office
originally said that 11 counties had the same problem but has since revised that
to nine. Her office was not able to say how many dropped votes were discovered
in those jurisdictions.