how to solve the spawned enemy health problem

Hi,

I make a game to spawn different enemy, enemy's health will decrease when it is on collision with character, but the problem is when the collision one decrease health as the well as others without collision with character, sorry for english is not well, someone knows how to solve this , please help

file: https://www.dropbox.com/s/sl6alheyr09do ... .capx?dl=0

thanks