Collision object colliding with 2 actors only registers 1 when both are in the spawn area


I am trying to do a AOE damage to all actors within the range of a poison ground effect. At the place where the poison hits the ground I spawn a invisible actor with collision enabled. This works like a charm and all of my actors are being hit when they are alone in the AOE.

As it is a AOE spell all actors with the spawned hitbox should register the damage but I only get 1 random units to trigger the overlap detection when the actor with the capsule detection spawns while multiple units are colliding with the spawn.

is there any way to get all actors trigger the overlap effect? it is not a collision issue as when only 1 units is inside the range it allways triggers nicely.