Jazz777 wrote on Sep 1^st, 2012 at 5:00am:

I press Z to disengage the autopilot. And there was tailwind during approach around 16 knots( not a big deal ). :P

16 knot tailwind! That's quite a bit of wind! You must have a pretty strong crosswind too.

Maybe you could try another flight with no winds just to see if anything different happens.