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I am also having a similar problem. After doing all the configuration multiple times and checking my wiring it has come to my attention that the pi2 is just not recognizing the tactile buttons. If you figure out the issue please let me know.
Edit: I have done some research and think that there is something different about the gpio on the pi2. Some people have done a workaround like Francky95 by connecting it through usb. Although I am not experienced enough to do that myself.