Well we could go and guess what you are doing, or you could show us..
I'm not sure what you mean by a spawner, as far as I know there is no spawner object in C2.
you probably mean either the sprite spawn action or the system create action..
Both of these create objects at a location you specify, but neither has anything to do with the fact your enemies all act the same..
If you want a specific enemy to do a specific thing while other enemies do other things, you should make it clear in your events which enemy you want.
My guess is you are using the system compare action, which doesn't pick any instances..