Have you guys noticed a glitch with the helicopters? All the parts were green, with an empty tank. It took a bunch us forever to refuel it (it needed definitely more jerrycans to see the fuel gauge going up) and as soon as we turned the engine on,the helo started to beep and lost its fuel in a couple of seconds! The only time we were able to fly one was when we found one with half a tank filled. Someone had the same problem?