Quber is actually right. The numbers aren't queued up or produced on demand. The RNG's produce numbers continuously, ten's of thousands a second, when you press spin you get whichever number has been produced at that particular moment in time.
So if you have stopped the reels on one spin, the next time you press spin, you will most likely be doing so, slightly earlier than if you had let the previous spin run it's course. Even pressing spin a fraction of a second earlier or later will give a different spin, be it good or bad
A Casino Butterfly Effect, I hope that cosmically it leads to me hitting a Wildline on DOA right....about......NOW~!