Only client collides with his own projectile

Helly everyone, my character can shoot a fireball wich shall collide and then explode with the next dynamic object it collides with. It moves slightly slower than the character itself so it is possible for him to catch it after he fired it.

I tried to work with the “Ignore Actor when Moving” node and it works perfectly on the Server side but somehow not on the clients :(.

I tried almost every iteration of RPCs and other Multicast/Run on Server methods i knew but i cant get it to work.