"One operator had apparently enlarged the font size on their computer screen, perhaps cutting off Mr. Buttigieg’s name from the list of options..."

The NYT has unnamed sources who explain what went wrong with that Des Moines Register poll that was withheld at the last minute.

The Register itself only said: "a respondent raised an issue with the way the survey was administered, which could have compromised the results of the poll. It appears a candidate’s name was omitted in at least one interview in which the respondent was asked to name their preferred candidate."

In the NYT we learn that one person who was surveyed was given a list of names that did not include Buttigieg, and this person contacted the Buttigieg campaign, which took the issue to the Des Moines Register. That is, if it were not for that one person noticing and caring enough to contact the campaign, the poll would have gone out.

In case you're wondering how reliable polls are! One operator enlarges the font, and the randomized list of names on the screen is missing a name. The operator could have scrolled down, I presume, but this is someone given the freedom to enlarge the font but not with it enough to remember that the visible screen is not the whole page.