Funny metar stuff?

Tonight my metar is finally working and is showing the correct image for overcast. But if I click on it to launch the metar and summary image display, the main displays image goes to party cloudy for about 40 seconds and then reverts back to the overcast image?? Why is it doing this? I also notice when WD is started it takes several minutes to update the image to the correct image. Why does it always start with the partly cloudy image. It should start without an image and then update to the correct one.