Many late ballots are military ballots.
There’s also the situation with Cambria County. They had some kind of problem with their voting machines or voter registration records on Election Day, so thousands of people there had to cast provisional ballots. Trump won that county by something like a 65%-35% margin in 2020, so these can be expected to be heavily Republican votes as they are counted.
Watch how fast the Dumbs suddenly start paying attention to the irregularities as they consider the military ballots.