i am getting clearance for approach to runway that shouldn't active given the wind directions.. Do you follow me ?
You said you are "getting runways that do not even exist ". The reason for this is explained in the thread above, read about the "Star technique" or X-Wind runways. They are dummy runways to allow this. And you aren't cleared to land there, they are only announced in the ATIS.
About getting the "wrong" runways that DO exists instead, I'm not sure that 6 knots tailwind is enough to switch runways, but this is something FSX does in its own anyway, and it's possible that if the wind changes suddenly, the runways is not reassigned immediately.