Multiple Dispatch Centers W/Helicopter

I have 3 PD helicopters operating between 2 dispatch centers (one in Kansas city mo and the other in Orlando FL). Ive noticed that when I dispatch the Florida stations to something, it offers the MO helicopters as an available unit regardless of the distance selected. Is this just part of the game or a random bug? I have alarm responses set up and a few times have noticed the cross country flight of a helicopter responding to a call.