GeometryUtility.CalculateFrustumPlanes and orthographic camera

Hi, I need to know(*) the planes of the frustrum of a orthographic camera:

planes = GeometryUtility.CalculateFrustumPlanes(orthoCam);

To view the result I do:

 int i = 0;
 while (i < planes.Length)
 {
   GameObject p = GameObject.CreatePrimitive(PrimitiveType.Plane);
   p.name = "Plane " + i.ToString();
   p.transform.position = -planes[i].normal * planes[i].distance;
   p.transform.rotation = Quaternion.FromToRotation(Vector3.up, planes[i].normal);
   p.transform.localScale = Vector3.one * 20.0f;
   i++;
 }

All planes match the visual representation of the frustrum in the editor, except left and right planes. Any clues?

Thank you!

(*): Trust me.