hide and show node for turret places

hello guys, i got a problem here to hide and show node. when first play to test code, all node always hide perfectly. then i try hit turret button to select turret and show all node, the problem come. the node just three of them has appear in game. currectly i have 36 node in game.

here my code:

 using UnityEngine;
     
     
 public class Shop : MonoBehaviour
 {
         public GameObject nodes;
         private MeshRenderer[] meshRend;
     
         public TurretBlueprint gutlingPro;
     
         BuildManager buildManager;
     
     
         private void Start()
         {
             buildManager = BuildManager.instance;
             meshRend = nodes.GetComponentsInChildren<MeshRenderer>();
             EnableDisableNodeMeshRenderer(); //set node mesh render to false when first start game
         }
     
     
         public void SelectGatlingPro()
         {
             Debug.Log("GutlingPro Selected");
             buildManager.SelectTurretToBuild(gutlingPro);
             EnableDisableNodeMeshRenderer(); //set node mesh render to true when turret button clicked
         }
     
     
         public void EnableDisableNodeMeshRenderer()
         {
             if (meshRend != null)
             {
                 foreach (MeshRenderer MR in meshRend)
                 {
                     if (MR.enabled == false)
                     {
                         MR.enabled = true;
                         return;
                     }
     
                     MR.enabled = false;
                 }
             }
         }
 }

and all three node that appear is three first node in child.......... i have GO name Nodes for parent and default unity cube GO name Node for child so, what is going wrong in my code? please guys, i need your help, im stuck and confused.

Note: no error and warning in VS error list, no error and warning too in Unity Console