Is the layered Defense Array bugged?

I returned to the game after months of not playing and the game was going fine until now. I am attacking a servant station that has a single layered defense array, with 13 monitors equipped with Plasma battery Mk 1 and two 60 cm Ultraviolet laser batteries.

They only had railguns and PD so I was able to stay away shooting plasma at the station without taking any damage, but the Defence array was not taking any damage from the plasma. I think I shot over 2.000 plasma rounds at the Defence array and it apparently hadn't taken any damage (stayed at blue health), but the numbers said that I was doing damage.

I got closer with my laser and also did no damage until about 200 - 150 km when it died in 5 seconds to the lasers. Is there a bug or is there a new mechanic around armor that was implemented that was stopping my damage?

Also I had no issues with energy or heat in any of my ships, could kill the ships defending the stations with plasma and the top armor research at the moment is adamantine. Please help me understand what is happening!