Problem with clouds!!

[Butcher_ss]

In the Nevada campaign, I've noticed strange with the clouds. I was flying above some clouds and I started flew below them in order to deliver some MK-20s. I passed below the clouds and at a certain altitude the clouds appeared again from nowhere making it impossible to us the bombs. The same thing happened when I tried again to use the bombs. The clouds appeared from nowhere at a very low altitude just as I was about to CCIP some bombs. A bug perhaps??