Can you tell us more about what you hope to see? The Unwrap surface you generated (Inventor 2021, by the way) looks good to me, but it's never going to be perfect because it takes no account of material properties. You can't make a very 3D surface into a 2D surface without stretching/compressing-- this is the whole basis for the profession of cartography: making useful 2D maps describing a 3D planet.
Sam B
Inventor Pro 2024.1.1 | Windows 10 Home 22H2