Arrow Blows Me Up Instead of Where It Hits

As the title says, i get blown up instead of where my projectile hits. it seems to kill the entities around where it hits too, but doesn.t actually make an explosion.

i cant find out how to upload a picture so my code is like this: 

Event trigger - triggered by external call
or when (global trigger): No additional trigger

Explode at X: X position of event/target entity
Explode at Y: Y position of event/target entity
Explode at Z: Z position of event/target entity
With power: 10
Source Type: TNT

thanks for helping!