>>>It's unlikely but possible that a new stalker cat will spawn after the first one is killed in your current generation but it's unknown what triggers this respawn.
I faced double stalker cats (the second appeared after I killed the previous one) twice during the recent two generations in Jungle. I assume that the second stalker cat appears after I collected all the meat and bones of the previously killed stalker cat and its carcase disappeared. The second cat remained unharvested. After that, I didn't see the third cat in the same generations.