Transform.LookAt doesn't work in my script for multiple objects

Hi! This is very basic script, but it doesn't work as it should. It is attached to 3 different objects, works perfect only on one of them. I don't have any clue what is wrong with it. I hope you will answer my question. (script for item examination / inspect)

CODE:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class ItemPick : MonoBehaviour
 {
     public Camera parent;
     public Camera kamera;
 
     private Transform obiekt;
     public float rotx;
     public float roty;
     public float rotspeed = 40f;
 
     public Vector3 przesuniecie;
     public Vector3 rotacja;
 
     public Vector3 startPos;
     public Quaternion startRot;
     public bool looking;
 
     void Start()
     {
         obiekt = GetComponent<Transform>();
         startPos = obiekt.position;
         startRot = obiekt.rotation;
     }
 
     void Update()
     {
         Debug.DrawRay(parent.transform.position, Vector3.forward, Color.yellow);
         roty += Input.GetAxis("Mouse Y") * rotspeed * Time.deltaTime;
         rotx += Input.GetAxis("Mouse X") * rotspeed * Time.deltaTime;
 
         if (looking == true)
         {
             print("yes");
             obiekt.rotation = Quaternion.Euler(roty, rotx, 0);
             parent.cullingMask = 1 << 0 | 1 << 1 | 1 << 2 | 1 << 4 | 1 << 5 | 1 << 8 | 0 << 9;
             kamera.cullingMask = 0 << 0 | 0 << 1 | 0 << 2 | 0 << 4 | 0 << 5 | 0 << 8 | 1 << 9;
             kamera.farClipPlane = 1f;
             kamera.transform.LookAt(obiekt);
         } else if (looking == false)
         {
             roty = 0f;
             rotx = 90f;
             parent.cullingMask = 1 << 0 | 1 << 1 | 1 << 2 | 1 << 4 | 1 << 5 | 1 << 8 | 1 << 9;
             kamera.cullingMask = 0 << 0 | 0 << 1 | 0 << 2 | 0 << 4 | 0 << 5 | 0 << 8 | 0 << 9;
             kamera.farClipPlane = 1000f;
             kamera.transform.LookAt(parent.transform);
         }
     }
 
     void OnMouseDown()
     {
         looking = true;
         obiekt.localEulerAngles = rotacja;
         obiekt.position = kamera.transform.position - przesuniecie;
     }
     void OnMouseUp()
     {
         looking = false;
         obiekt.position = startPos;
         obiekt.rotation = startRot;
     }
 }