Maintaining a voters' list is an amazing task. We should not expect 100% accuracy. And there will always be instances of where the voter list failed.
Unfortunately too many people will take the small number of cases of administrative errors and fraud to debunk the election results.
After the 2016 election, a left-leaning media outlet spent a great deal of time pointing out that several prominment Trump supporters were on the voters' list in several states. This should be considered a natural occurance as people change homes and addresses. I doubt many people moving across state lines put "I must deregister myself as a voter in my former state" as a high priority of things to do for the move. And I doubt that many of these double-registered people drove across state lines to vote more than once on election day. And the number of people who did this would not have affected the final result. Yet the media outlet continued telling this story for a long time.
This game is being played by both sides.