Wtf bullet direction ?

When I shoot, the bullet (run on server) always goes straight, parallel to the ground! If I aim up or down, she always goes straight …

The Location and rotation is calculated with the Camera, and I tried with another invisible actor placed before to try to modify the trajectory, it always goes straight … Help!
Thanks

Update : I found the error, just drag the node SpawnTranform to the custom event, and connect the actor with GetWorldTransform to the pin just created on the call function.