I'm not sure, so don't quote me, but doesn't the Mavic have some form of fisheye lens? I notice under the specs on DJI's site, that it lists it has some level of distortion on the lens.
Lens FOV 78.8° 28 mm (35 mm format equivalent) f/2.2
Distortion < 1.5% Focus from 0.5 m to ∞
I imagine that could play a role in your problem, however it may not be the only issue.