"During the first small audit (recount) it was discovered that Republican votes were undercounted and Democrat candidates were overcounted. This anomaly was discovered during a hand recount of the ballots as compared to the electronic tabulation results."
Windham, New Hampshire, Auditor Says 60% Error Rate "Way Higher Than We Expected" - President Trump Reacts - The Last Refuge
The test of folded -vs- unfolded ballots (counted by same machine) showed a high number of errors. The rate of error was a whopping 60%.
https://theconservativetreehouse.com/2021/05/24/windham-new-hampshire-auditor-says-60-error-rate-way-higher-than-we-expected-president-trump-reacts/