If you're trying to activate more than (I think) 20 at once, then it could be that you're activating too many. There's a limit to how many you can have going at once, as to not overload the Xbox. Try making a smaller cannon and see if it still works.
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The good people, they always die. And the bad people do too...But the weaker people, the people like me, WE have inherited the Earth. -Morgan Jones
tnt dissapearing