It's intended. Suppressors boost muzzle velocities which increase projectile energy (ie damage).

Down vote. As cool as it might look, it's actually less realistic than 2D scopes. Your FOV is already fairly limited on a monitor and the issue is compounded by the limited resolution as well. Until VR headsets allow us to position one eye in front of a physically modeled scope, a full screen, animated 2D reticle is the the most accurate representation of what it's like to shoot with a scoped rifle. They could do the same in 3D, at the expense of more resources for a very similar effect.