Giant Battle

I am at the very last stage of a Giant Battle but the mammoth & Risi are covered on clouds & I can't shift them or get the generals to attack under it. I had this problem last time I played Giant Battle (last week, I think) but somehow got over it - I may have had a shard left to shift another boulder - I haven't this time.
This seems new. I never used to have this problem. I've tried logging in & out without success. Can anyone help me? Thank-you.

I logged out for an hour or so & when I came back two more camps were visible taking me closer to the mammoth & Risi. probably what I did last time but it was worrying with PFB, Premium & Scouting Post on that I might not have got the full rewards.