Ok, I see what's going on. I looks like you've chosen the Large scene size. I missed your earlier comment about using Realistic Sky v.s. the"old" sky settings. The Realistic Sky respects the  scene scale - the other Sky setting does not. So, your clouds are really, really low; the camera is above them. You an adjust the altitude

I haven't used the "old" sky settings for so long that I forgot about this little quirk.