You are not alone and it is actually something very common. At some point I estimated that 5 to 10% of the bottles I have seen have something, little particles inside. From Aqua velva to Serge Lutens. A while ago I was selling a bottle of Eau dOrange Verte, but I had to break the deal with the buyer at the last minute. He probably would not have noticed, but I knew there was stuff inside the bottle . My bottle of obsession night has this huge ball of fluff floating in it... I wonder if I can sue CK
The only thing that worries me about all that, is the fact that the sprayer may eventually fail if the particles are too big.