It is generally believed that the outcome of tossing a coin of even quality is random. But in fact, the result of the toss is determined by the momentum and the initial height. Still, making accurate predictions about the outcome of a coin toss is difficult.
Accurate prediction of the outcome of a coin toss requires extremely accurate estimates of the initial height and momentum of the coin toss explains most the phenomenon stated in the above, that the outcome of the toss is determined by certain factors, but the prediction is difficult.