Adobe Camera Raw applies a built in profile for the
Phantom 4 Pro lens - Check the lens section of ACR and you will see it uses FC6310 24.0 mm which corrects Barrel distortion, chromatic aberration and vignetting
Just because you can't see it doesn't mean it's not there

Use a different raw editor which ignore the embedded profile and you'll get a very different view
Below is the same raw file in Rawtherapee and Adobe Camera Raw - there's quite a difference as you can see
At first glance, this isn't much of an issue, just correcting the nasty stuff we don't really need but there is more to it than that and the comment above from KevMo 'If you open it in Adobe Raw all your problems are gone' is far from the truth.
During this conversion process, the raw image is corrected and cropped down to about a 15 - 16 mp image and then enlarged back up to 20 mp on output - this means that we are working on files that have been enlarged by approximately 25% - this is a destructive edit of the original file so the quality is reduced.
There's no simple solution as you cannot ignore this profile in Adobe Camera Raw