In 2021 Moderator Election the participation at the recent election is reported as
52,685 voters were eligible, 12,611 visited the site during the election, 5,834 visited the election page, and 1,905 voted
whereas Mathematics Stack Exchange Moderator Election 2021 Results states that
The number of ballots is 1882 and there were 1882 valid ballots and 0 empty ballots.
I wonder where the difference between the numbers “1,905 voted” and “The number of ballots is 1882” comes from.
In the preceeding three elections, the reported number of voters on the election result page is identical to number of ballots on the corresponding OpaVote page. Why is there a difference in the 2021 election?