Just because something follows the patterns of waves doesn't mean it is a wave. It is still a particle. By observing it, you add light, and light changes its behavior--because light is a wave.
I hear about this experiment all the time spouted by those who want us to stand in awe of quantum mechanics, and I think people over-complicate this.
Think of dropping a bunch of Styrofoam balls into the water. They all spread out--the center containing more than the edges. Now, create a constant wave in the water. The little balls will line up as if they are part of the wave. But they are not waves. They are being effected by the waves.
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