Hi basically I have the same question like maxrpg in this Topic.
Only that it doesn't work for me. And the difference maybe, that I have an Enemy-Family
So if there are 2 enemies overlapping each other the Bullet Sprite will subtract HP from both of the Enemies on collusion instead of only on. For example the one on top.
I asked the same question years ago. Sry for that. The solution is here.
It works by overlapping but not by collusion. Why?
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Bullet on collision with Enemy Enemy pick top instance Enemy subtract 1 from HP Bullet destroy
If you don't want to destroy the bullet, you can disable collisions for it.
If this doesn't work, please post your project of events screenshot.