At least one Iowa county shorted Biden on delegates.

[RandySF]

Delegates calculated improperly:
At least 28 precincts

What’s wrong
The rules for calculating delegates are complicated and not always intuitive. There are additional rules for ties, and contests can come down to a coin toss.

In this example from Dubuque County, because of errors in the delegate calculations, Mr. Buttigieg was awarded a delegate that should have gone to Mr. Biden.



https://www.nytimes.com/interactive/2020/02/14/us/politics/iowa-caucus-results-mistakes.html

[Recursion]

1. They usually "fix" this at the state convention

There are always errors like that, and they usually get smoothed over at the state convention, modulo a then-frontrunning campaign nabbing another delegate or two.

God I wish they would just end this caucus dog and pony show.

[democratisphere]

2. Caucuses and electoral colleges make sense for our banana republic.

[Omaha Steve]

3. This was a county delegate, not a national delegate

And this one went the other way: What it means In 21 precincts, candidates who did not earn enough support to win any delegates appear to have won them anyway.

In the example above, from a precinct in Black Hawk County, the minimum votes required for viability was six. There were only five in former Vice President Joseph R. Biden Jr.’s group, but he still received one delegate.

Caucusgoers who initially chose Mr. Biden should have had to make another choice, or persuade a member of another group to join them. But since they did not, it’s impossible to know which candidate they might have chosen or how those choices would have changed the results.