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question about SpawnActor's rotation

I have create a C++ class and this class spawn projectile.
Then I create a blueprint from the class and drag blueprint into scene. (It’s a spawn point)

My question is no matter how I rotate the actor in scene the spawn direction won’t change.
But GetActorRotation() refer to the root of actor right?
I use GetActorRotation() as rotation of my SpawnActor’s rotation like code below.

World->SpawnActor<AFPSProjectile>(ProjectileClass, GetActorLocation(), GetActorRotation(), ActorSpawnParams);

Did I do it wrong?
Please help me figure this out, thanks.