scanners mis-interpreted voters' marks on 0.1% and 0.2% of ballot sheets respectively. These were not enough to change any outcomes, and involved voters' marks which barely touched the ovals intended to record votes. They were discovered by independent software re-examining all the ballot images. in a 2020 election in Antrim County, MI, last minute updates to some ballots were not applied to all scanners, so the scanners had inconsistent numeric codes for different candidates and styles of ballots, causing errors of thousands of votes. Corrections happened in stages, leading to less and less confidence in the results. Results were eventually confirmed by a hand count. In a 2020 election in Windham, New Hampshire, fold lines in the wrong places and dust on scanner sensors caused many fold lines to count as votes. In a 2020 election in Baltimore, Maryland, the private company which printed ballots shifted the location of some candidates on some ballots up one line, so the scanner looked in the wrong places on the paper and reported the wrong numbers. It was caught because a popular incumbent got implausibly few votes, and corrected by hand-copying mailed ballots onto well-formatted ballots. In a 2019 election in Northampton county, Pennsylvania, the software under-counted one candidate by 99%, reporting 164 votes, compared to 26,142 found in a subsequent hand-count, which changed the candidate's loss to a win. In 2018 scanners in various states had problems from humidity, rejecting too many ballots, rejecting staff passwords, delivery to the wrong locations, broken machines, power outages, screen calibration shifting votes to other candidates, and broken cartridges to start machines. In a 2018 New York City election when the air was humid, ballots jammed in the scanner, or multiple ballots went through a scanner at once, hiding all but one. In a 2016 Maryland election, a comparison of two scanning systems on the same ballots revealed that (a) 1,972 ballot images were incorrectly left out of one system, (b) one system incorrectly ignored many votes for write-in candidates, (c) shadows from paper folds were sometimes interpreted as names written in on the ballot, (d) the scanner sometimes pulled two ballots at once, scanning only the top one, (e) the ballot printers sometimes left off certain candidates, (f) voters often put a check or X instead of filling in an oval, which software has to adapt to, and (g) a scratch or dirt on a