Algodoo

Is it normal? Well, if you are asking if that would happen in real life, I would guess probably not, unless the right conditions were met. I believe what's happening is the large circumference, while trying to roll along the darker track, is dragging the smaller circumference along the lighter colored track. If the coefficient of friction is high enough, and the slope of the tracks is small enough, the assembly of circles will get stuck at various places along its path.

With gears and racks the gears will not roll. With circles and blocks and µ < 2.00, the large wheel will dominate and the small wheel will slip. I would expect this to be the case in real life.