Monster Generators and the Alphabet

When I need a character/s to appear when a condition has been met I use a monster generator. I attach the script "toggle generator on/off" to the first heartbeat of another critter. In this way the generator can be turned off before it produces a single spawn...in theory.
However in practice, sometimes it works and sometimes it doesn't. The other day it came to me that the critters name had an effect on this. If the critter's name is before the critter being generated in the alphabet, it works. If not, it doesn't.
Example: A halfling bandit will turn off a halfling guard generator.
A halfling villager will not turn off a halfling guard generator (until it is too late).
However this does not seem to work between different menus. Brute fang (animal) does not turn off a halfling guard.
Can anyone explain this?

 

Sounds like it's an issue of how long it takes the generator to scan from one name to the next. Animal is quite far from Halfling. The order is unimportant, it's the distance.

 

After having a more thorough look I have come to that time honoured arcanum conclusion: It just doesn't make sense.

I've tried to reproduce it, with the exact same scripts but this time I am getting different results. Gah! The alphabet theory and the proximity theory (Blinky) both seem to apply sometimes but not other times.

DU, I know from my description it appears I am using the generator when I don't need to, but the situation is more complicated than I could be bothered explaining.

{3}{I'm going to focus on dirt!
-Leonard}