Workaround for rotating camera OK?

I was having a problem where the position of the camera including offset was fine, but the camera was rotating along with the ball. I created a new statement fixing the rotation at 45, 0, 0. This seems to work fine, but I'm not really sure where I went wrong / what I have fixed.

 using UnityEngine;
 using System.Collections;
 
 public class CameraController : MonoBehaviour {
 
     public GameObject player;
     public Vector3 offset;
 
     void Start () 
     {
         offset = transform.position - player.transform.position;
     }
 
     void Update()
     {
         transform.rotation = Quaternion.Euler (45, 0, 0);
     }
 
     void LateUpdate () 
     {
         transform.position = player.transform.position + offset;
     }
 }