On election day Trump was on his way to an easy victory, then they suddenly stopped the counting for a few hours, which has never happened before, and then suddenly his large lead in several states started evaporating, and then overtaken.
So to answer your questions, they probably needed time to get the fake votes.
Oh, a bitter trump fanatic, so sorry for your loss buddy. progression of votes is expected to be slow in this time of crisis. I am not even a voter of American, and not even in America. Plus, Trump is the one who has power to fake anything, he has the authority to do so. So if there is nothing even suspicious about this. and yeah, also, this kind of overtake really happens in politics, even in other country. So stop being bitter, and accept that your president is now BIDEN.