Problem with rotation to mouse position

Hi,

I got a 3D tank game where you should control a tank and the gun turret is pointing to your mouse position. This basically works but sometimes the rotation from the gun turret is "jumping" from 7 to 23, instead of pointing at the mouse position.

My script: (I found it on the internet)

 using UnityEngine;
 
 public class TankTurret : MonoBehaviour
 {
     Camera cam;
 
     // Start is called before the first frame update
     void Start()
     {
         cam = Camera.main;
     }
 
     // Update is called once per frame
     void FixedUpdate()
     {
         Ray ray = cam.ScreenPointToRay(Input.mousePosition);
         RaycastHit hit;
 
         if (Physics.Raycast(ray, out hit))
         {
             Vector3 target = hit.point;
             target.y = transform.localScale.y / 2f;
             transform.LookAt(target);
         }
         
     }
 
 }

I also got a Video where you can see what i mean by "jumping" from 7 to 23:

videolink

Thanks for reading :)