Max range vs. aircraft seen

[cs.dk]

Hi,
Had a look at other recievers here in Denmark.. Can some one tell me, how it's possible to have that huge range, at that small amount of planes on the map?
Does the reciever overload, or what happen?

My Pi reciever is on the left.

[cs.dk]

No one with a clue?

Took a new screenshot today, it's very consistent.. I can't figure out whats going on.

[Runway 31]

Possibly needing a bit of gain adjustment

Alan