Hmm... That Scanner in the Screenshots has one major issue : it is set to minimum Range
During Exploration, I always set mine to maximum Range. That'll give a far more realistic representation of Bodies.
Note though that any nearby Body will affect the actual Scanner scaling, similar to locking up any Ship when in SuperCruise. But that detail is working as intended.
That auto-scaling based on distance to nearest Gravity Well can be easily observed when flying away from a Sun with several Planets orbiting it (at least in Log Scale).
Other than that, the Scanner displays an imaginary sphere, thus even extremely distant Objects will appear as Objects on the edge.
When such distant Objects are sitting directly above or below, that on first sight will look "closer than they appear" by its design.