Stealth not working as intended?

Im running a Shrike with 1000EM, 400 IR, and 3k CS. I've noticed medium fighters picking me up at 10km, which should be impossible. A S2 Radar shouldnt be able to pick me up until 1km.
One had the audacity of telling me he was "using his eyes" which would be about a pixel on a screen against the backdrop of stars.

So, hes either fishy or stealth isnt working as it should at the moment. Anyone else experiencing anything that resembles?