This effect is happening because particles are segmented aspects of waves. If you shoot one particle or a few particles and you only see a portion of that particular wave. A wave in nature is not on an 2d x y axis but a 3d cyclone spiral. So you should think of particles on invisible 3d wave tracks or "guard rails". This is also why you look at a "wave" it turns into a particle that retroactivity forms back to the source. You see the particle tracks of that particular wave.