Playmaker Killable Attack or Hit Points Add, Prefab Error

So I made a basic cube that functions as a power up to increase the damage of my character's gun.  The Killable script is on the "bullet" prefab and the custom action adds 1 extra damage to the bullet prefab when picking up the cube.  However after exiting play mode I realize that the attack point value for the bullet prefab stays raised. I have to then manually change the number back in my prefab.  So I figure I am not using that custom action correctly and I was wondering how it was meant to be used.  I just want the player to be powered up til they die or a new game starts.

Respectfully,
Duke

Edit: It does the same thing with health.  If the custom action references something in the scene it resets after play fine but if it references a prefab then that prefab remains changed after play.