isKinematic does not always work

hello, I have the following problem: I want an object to skit at ground, so I do

             GetComponent<Rigidbody>().isKinematic = true;
 

BUT SOME OF THE OBJECTS CONTINUE TO MOVE ANYWAY. what am I messing?

full code is here as well

 using UnityEngine;
     using System.Collections;
     
     public class rand_movm : MonoBehaviour 
     {
         //
         public GameObject go;
         //
     
         public float timer;
         public int newtarget;
         public float speed;
         public NavMeshAgent nav;
         public Vector3 target;
     
     
         void Start()
         {
     
             nav = gameObject.GetComponent<NavMeshAgent>();
         }
     
         void Update()
         {
     
             //
             float dist = Vector3.Distance(go.transform.position, transform.position);
             if (dist < 6)
             {
                 GetComponent<rand_movm>().enabled = false;
                 // transform.position = new Vector3(go.transform.position.x, go.transform.position.y, go.transform.position.z);
                 gameObject.transform.position = new Vector3(1, 5, 1);
     
                 GetComponent<Rigidbody>().isKinematic = true;
     
     
     
             }
          else
         {
     
             timer += Time.deltaTime;
             if (timer >= newtarget)
             {
                 newtarget1();
             }
             timer = 0;
     
         }
     
     
         }
     
     
     
         void newtarget1()
         {
             float myx = gameObject.transform.position.x;
             float myz = gameObject.transform.position.z;
     
             float xpos = myx + Random.Range(myx - 100, myx + 100);
             float zpos = myz + Random.Range(myz - 100, myz + 100);
     
             target = new Vector3(xpos, gameObject.transform.position.y, zpos);
     
             nav.SetDestination(target);
         }
     }

 
 
 

Blockquote Thanks!