Editor script not working correctly in unity, how to solve?

Question

C++ / C#

I need to display a list of objects that contain a sheet of strings. When creating a new object in the editor, it is displayed incorrectly, but if the code is updated, then everything is correct.
editor script:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEditor;
using System.IO;
using UnityEditor.SceneManagement;


[CustomEditor(typeof(BundlesManager))]
public class BMEditor : Editor
{


    private BundlesManager bm;
  public void OnEnable(){
    bm = (BundlesManager)target;
  }
    
  public override void OnInspectorGUI(){
        EditorGUILayout.BeginVertical();
    if (bm.bundles.Count > 0) 
            foreach (Bundle bundle in bm.bundles) {

                EditorGUILayout.BeginVertical("box");
                bundle.name = EditorGUILayout.TextField ("Bundle name", bundle.name);
                if (GUILayout.Button("Remove bundle", GUILayout.Width(110), GUILayout.Height(20)))//удаление объекта
                {
                    bm.bundles.Remove(bundle);
                    break;
                }
                if (bundle.engDictionary.Count <= 0)//если нет слов, создать
                {
                    bundle.engDictionary.Add("");
                    bundle.kazDictionary.Add("");
                    bundle.rusDictionary.Add("");
                }
                EditorGUILayout.PrefixLabel(bundle.name + " : " + bundle.engDictionary.Count);// отображение кол-ва слов в объекте
                bundle.show = EditorGUILayout.Foldout(bundle.show, "Слова");//выпадающий список
                if (bundle.show)
                {
                    GUILayout.BeginVertical("box");

                    if (bundle.engDictionary.Count > 0)
                        for (int i = 0; i <= bundle.engDictionary.Count; i++)
                        {
                            EditorGUILayout.BeginHorizontal();
                            bundle.engDictionary[i] = GUILayout.TextField(bundle.engDictionary[i], GUILayout.Width(75));
                            bundle.kazDictionary[i] = GUILayout.TextField(bundle.kazDictionary[i], GUILayout.Width(75));
                            bundle.rusDictionary[i] = GUILayout.TextField(bundle.rusDictionary[i], GUILayout.Width(75));
                            if (GUILayout.Button("X", GUILayout.Width(20), GUILayout.Height(15), GUILayout.Height(15)))
                            {
                                bundle.engDictionary.RemoveAt(i);
                                bundle.kazDictionary.RemoveAt(i);
                                bundle.rusDictionary.RemoveAt(i);
                                break;
                            }
                            EditorGUILayout.EndHorizontal();
                        }

                    GUILayout.EndVertical();
                }
                if (GUILayout.Button("+", GUILayout.Height(20), GUILayout.Width(20)))
                {
                    bundle.engDictionary.Add("");
                    bundle.kazDictionary.Add("");
                    bundle.rusDictionary.Add("");
                }


                EditorGUILayout.EndVertical();
      }
    
      else EditorGUILayout.LabelField("No bundles in memory");
    if (GUILayout.Button ("Add bundle"))
        {
            bm.bundles.Add(new Bundle());


        }

        EditorGUILayout.EndVertical();
        if (GUI.changed) SetObjectDirty(bm.gameObject);//Если были изменения, сделать сцену грязной (для сохранения)
  }

    static void SetObjectDirty(GameObject obj)
    {
        EditorUtility.SetDirty(obj);
        EditorSceneManager.MarkSceneDirty(obj.scene);        
    }
}

Bundle manager:

public class BundlesManager : MonoBehaviour
{
  public List<Bundle> bundles;
}

[System.Serializable]
public class Bundle
{

  public string name;
  public List<string> engDictionary;
  public List<string> kazDictionary;
  public List<string> rusDictionary;
    public bool enable; // активен ли бандл
    public bool show;// раскрыть список слов
    
    

}