Rather than a focus issue, could it be that you've got subjects with light areas that are overexposed and brighter than the other parts of the scene?
I did a quick tweak of shadows and highlights.
Is that any better?
If you'd shot on an overcast...
More info ?
How long is it taking?
Has this just happened once or multiple times on the same day?
How long was it since you flew previously?
Confirm that the drone has a clear, unobstructed view of most of the sky?
I proudly served in the Navy and had my last year during the Gulf War, received a medal of commendation for finding a crack in a tail rotor blade that was missed earlier that day while parked in the stack. The pilots and aircrew were sitting in...