I bought the railgun, and I played a battle. After the battle ended, I realized I wasn't using the railgun, but I was using the magnum, a turret I already bought. I went to switch to the railgun, but, for some reason, I didn't have it! I still had the same amount of diamonds before I tried to buy the railgun. Then I bought it again, and for some reason I had -478 diamonds left instead of 22 diamonds left!