I’d say it’s the blotchy sky, which looks like it’s just had some PH fill added.
When capturing the sky, take 5 photos after landing to fill in the Zenith with the actual sky and add them into your stitching app.
This is made easier by always starting your drone panos facing north. Then land and angle the drone up until the gimbal tilts app to 60deg. Take a shot facing North, East, south and west, then a final shot facing north with the gimbal pointing vertical.
These 5 shots will fill in the missing zenith from the Drones pano, and will give you a full Spherical image.
Example here.
Hi,