Issue With Multiple Instances of the same script

Hello, I am having a bit of a problem with a chat like script, basically, it'll only work in 1 place, I cannot have 2 instances of the script in the same scene, for only the first will work. Here is the script:

 using UnityEngine;
 using UnityEngine.UI;
 using System.Collections;
 
 public class ReadSign2 : MonoBehaviour
 {
 
     public Image chat;
     public Text text;
     public Image arrow;
     public Image question;
     public string test;
     public string test1;
     public bool start;
     public bool start1;
     public bool hit_z;
     public Transform player;
     public Transform point;
 
     void Start()
     {
         // Text.SetActive(false);
         //Chat.SetActive(false);
         Disable();
     }
 
     void Update()
     {
         point.LookAt(player);
         var fwd = point.forward;
         RaycastHit hit;
                 if (Physics.Raycast(transform.position, fwd, out hit, 1.5f) && hit.collider.transform.gameObject.tag == "Player2" && hit_z == false && start == false)
                 {
                     start1 = true;
                     question.enabled = true;
                     if (Input.GetButtonDown("Interact1") && Physics.Raycast(transform.position, fwd, out hit, 1.5f) && hit.collider.transform.gameObject.tag == "Player2" && hit_z == false)
                     {
                                 StartCoroutine(wait(1));
                         }
 
                     
                 }
                 else
                 {
                     start1 = false;
                     question.enabled = false;
                 }
 
 
 
         if (start1 == false)
         {
             question.enabled = false;
         }
 
         if (start)
         {
             GameObject Movement = GameObject.Find("Thomas");
             Movement.GetComponent<Move1>().enabled = false;
             Movement.GetComponent<Rotate1>().enabled = false;
             text.enabled = true;
             chat.enabled = true;
 
 
             StartCoroutine(BlinkArrow());
 
             if (Input.GetButtonDown("Interact1"))
             {
                 hit_z = true;
                 start = false;
                 Disable();
             }
 
 
 
 
             text.text = test;
         }
     }
 
     void Disable()
     {
 
         if (start == false)
         {
             StartCoroutine(wait1(1));
             hit_z = false;
             text.text = "";
             GameObject Movement = GameObject.Find("Thomas");
             Movement.GetComponent<Move1>().enabled = true;
             Movement.GetComponent<Rotate1>().enabled = true;
             chat.enabled = false;
             text.enabled = false;
             arrow.enabled = false;
         }
     }
 
 
     IEnumerator wait(float blinkTime)
     {
         yield return new WaitForSeconds(0.01f);
         question.enabled = false;
         start1 = false;
         start = true;
     }
     IEnumerator wait1(float blinkTime)
     {
         yield return new WaitForSeconds(0.1f);
     }
     IEnumerator BlinkArrow()
     {
         while (start)
         {
             arrow.enabled = false;
             yield return new WaitForSeconds(1);
             if (start)
             {
                 arrow.enabled = true;
                 yield return new WaitForSeconds(1);
             }
         }
     }
 }
 

Can someone explain what's going on? I'm rather new to C#, so if I could also get any pointers to make this script better, I'd appreciate that.

But why does this script only work in 1 place?