SmoothDamp bounce effect

I have a ortographic camera for a RTS game. When I approach the mouse to the screen borders, my camera moves harshly. So I decided to use Vector3.SmoothDamp to the Main Camera movement:

 transform.position = Vector3.SmoothDamp(transform.position, targetPosition, ref Vector3.zero, 0.5F);

Camera moves correctly but, when I change the direction of movement, the camera movement makes a little bounce (for example, I am moving my camera to the right, and then I move my mouse to the left of the screen, my camera bounce a little to the right and then moves smoothly to the left)

Why that happens?