Strange problem with Floating HealthBar

Hello,
I have a strange problem with the healthbar, as you can see, when I move the camera, or the object moves, the bar is badly positioned relative to the enemy (in this case, it's too far to the right).

Code (CSharp):

1.  
2. Vector3 targetPos = canvasRoot.transform.position + Camera.main.transform.rotation * Vector3.forward;
3. Vector3 targetOrientation = Camera.main.transform.rotation * Vector3.up;
4. canvasRoot.transform.LookAt(targetPos, targetOrientation);
5.