Acolyte Hungering souls numbers of projectiles problem

I'm developing Hungering souls. I have one point up to Eternal pyre. Along the way, there's Forbidden pact, that reduce the number of projectil, of -2. So the skill now only have one projectile. I have invested a point in Soul swarm, that is supposed to add 2 projectiles. But the skill still only throw a single projectile.

What is going on?

thanks