How did I get TWO balance beams?

Have two devices with the game installed. When you hit a snake goal, after you get the prompt awarding you the prize, place the prize and then open the game on another device. You should get a prompt letting you place a second identical prize. Speaking from personal experience, it works on iPad/iPhone and I've received x2 balance beams and snake rocks. Both snake rocks appear to produce snakes. As Lugash would say: "Balance beam produce nothing!"