Issues cycling through Game objects in dictionary and activating currently selected objects script

so with this script its attached to my debug manager, and when you press left or right arrow keys its supposed to cycle through the game objects within the dictionary, first off it cycles through multiple obejts every press, and does not go in order, second im trying to access the "GuardStateMachine" script that is attached to the currently selected guard and change the "setCurState" int , in order to activate a certain state within that guard and only that guard but i cant get any of it to work properly

using System.Collections; using System.Collections.Generic; using UnityEngine;

 public class debugmanager : MonoBehaviour {
 
     [SerializeField] public GameObject[] Guards;
 
     //Guard gsm;
     int selectedIndex = 0;
     //private GameObject theGuards;
     private GuardStateMachine gsm;
 
     int setState = 0;
 
 
     // Use this for initialization
     void Start () {
 
         Guards[selectedIndex].GuardStateMachine.setCurState

= setState;

         Guards = GameObject.FindGameObjectsWithTag("Guards");
         gsm = gameObject.GetComponent<GuardStateMachine> ();
 
         //gsm = GetComponent<Guard>();
 
     }
 
     // Update is called once per frame
     void Update () {
         if (Input.GetKey(KeyCode.RightArrow))
         {
             //if (selectedIndex >= 0 )
                 //Guards[selectedIndex].GetComponent<Selection>().SetHighlightEnabled(true);
             Debug.Log ("Right Pressed");
             //increment the index
             selectedIndex ++;
 
             // bounds check in case index goes higher than the objects in 
             // the array
             if (selectedIndex >= Guards.Length)
                 selectedIndex = 0;
 
             // output status
             Debug.Log("DebugManager selected object #" + selectedIndex);
 
             // Enable highlight on currently selected object in the array
             Guards[selectedIndex].GetComponent<Selection>().SetHighlightEnabled(true);
         }
         else if (Input.GetKey(KeyCode.LeftArrow))
         {
             //if (selectedIndex >= 0 )
                 //Guards[selectedIndex].GetComponent<Selection>().SetHighlightEnabled(false);
 
             //increment the index
             selectedIndex -= 1;
 
             // bounds check in case index goes higher than the objects in 
             // the array
             if (selectedIndex < 0)
                 selectedIndex = Guards.Length;
 
             // output status
             Debug.Log("DebugManager selected object #" + selectedIndex);
 
             // Enable highlight on currently selected object in the array
             Guards[selectedIndex].GetComponent<Selection>().SetHighlightEnabled(true);
 
         }
 
         if (Input.GetKeyDown (KeyCode.Alpha1))
         {
             if (selectedIndex >= 0)
                 //Guards[selectedIndex].GetComponent<GuardStateMachine>().SetCurState(0);
 
                 Guards[selectedIndex].GetComponent<GuardStateMachine>().SetCurState(0);
         }
         if (Input.GetKeyDown (KeyCode.Alpha2))
         {
             if (selectedIndex >= 0 )
                 Guards[selectedIndex].GetComponent<GuardStateMachine>().SetCurState(1);
         }
         if (Input.GetKeyDown (KeyCode.Alpha3))
         {
             if (selectedIndex >= 0 )
                 Guards[selectedIndex].GetComponent<GuardStateMachine>().setCurState(2);
         }
 
 
 
 
         if (Input.GetKeyDown (KeyCode.Alpha4)) {
             if (selectedIndex >= 0)
                 Guards [selectedIndex].GetComponent<Navigation> ().SetPingPong (false);
         }
         
         else if (Input.GetKeyDown (KeyCode.Alpha4)){
 
             if (selectedIndex >= 0)
                 Guards [selectedIndex].GetComponent<Navigation> ().SetPingPong (true);
         }
 
 
     }
 }