That's normal. Remember they are rotating blades so while one side is heading into the wind it is generating more lift and thus "bending up" while the other side is heading the other way, making less left and "bending down". Now put one set of rotors above another set, spin them in opposite directions and you get what you see in your pictures.
That leads to the problem of if you go to fast, do certain maneuvers and/or too much collective the blades will contact, rip off and cause many tears :)