That’s correct. You get 1 Female Hunter after your first Masquerade Violation, she hangs out behind the Asylum. Then on your 2nd Masquerade Violation 2 more get summoned, 1 Male in the parking garage who hides and waits for you and 1 Female who hangs out in the alley next to Trips Pawn Shop, smoking a cigarette.
If you don’t kill the previous Masquerade hunters then they accumulate over time, meaning when the new ones spawn the old ones stick around, until you kill them.