Yes, there may have been an algorithm set up so that for every 3 votes for Trump, the fourth vote would go to Biden. Also, could just set up the algorithm to be a random switching 25% of the votes from Trump to Biden.
https://www.youtube.com/watch?v=9tHeiYgErnw this link explains a lot but is 2 hours long, yet is very compelling.
or as is commonly done - a manager went in took a look and changed voters, registrations, and tallies manually