Are those systems level 5 corrupted?
EDIT: According to the Insurgency Info panel, those systems are currently level 5 corrupted. So the corruptions mechanics apply:
Stage 5 - Max Corruption
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UNIQUE: Highsec Only - Insurgency info panelAttacking ships, structures and drones is now possible without a criminal timer and CONCORD response. CONCORD will only respond to capsule kills or assisting someone with a criminal timer in the system.
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UNIQUE: Lowsec Only - Sentry Guns will now additionally ignore all criminal timers in their presence. Players can now use Interdiction Sphere Launchers, Warp Disruption Field Generators, Bomb Launchers and Defender Launchers.