Instant respawn issue

Hi, I use this mod a lot for my modes and I was wondering about something strange, I don't know if it's a glitch or not but I'll explain it as well as I can.

Basically, I think the timer for spawning will go off even when you're not in range or there's already an entity that was spawned.

For instance, if you had a zombie spawner, and a zombie has been spawned for 15 seconds (AKA the spawn time):

If you kill that zombie, another one will instantly spawn. If you kill that one, it will take 13 seconds if it had existed for 2.

Is this a glitch or is it intentional?

(COMMENTATOR FORM STEAM)