In "The Wall" game show, the slots and also the diverters are designed symmetrically and also identically. So when a ball is dropped from a particular slot number it should end up in a particular amount. But how does the ball end up falling into different amounts on other subsequent tries even when the ball is dropped from the exact same position. The entire wall is glass enclosed so there is no air resistance. The ball is also dropped by machine,no manual input hence equal force of drop in every try. I don't know which factor affects the ball as it changes its path in every iteration even when it is dropped from the same slot. Can someone explain the science behind this on why the ball takes different route each time?