Why does the canvas image, go, show up as soon as I press Mouse1?

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

public class Scope : MonoBehaviour {

 public Animation scope;
 public GameObject go;
   
 // Use this for initialization
 void Start()
 {
    scope = gameObject.GetComponent<Animation>();

     
     go.SetActive(false);
 }

 // Update is called once per frame
 void Update()
 {
     foreach (AnimationState state in scope)
     {
         
        

         if (Input.GetMouseButtonDown(1))
         {
             
             state.speed = 2;
             scope.Play();
         }

         if (Input.GetMouseButtonUp(1))
         {
             
             state.speed = -2;
         }

        if (Input.GetMouseButtonUp(1) && state.time == 0f)
         {
             go.SetActive(false);
             state.speed = -2;
             state.time = 0.49f;
             scope.Play();
         }

         if (Input.GetMouseButton(1) && state.time == 0f)
         {
             StartCoroutine("OnScoped");
         }
         if (Input.GetMouseButton(1) && state.time != 0f)
         {
             go.SetActive(false);
         }
        
     }

 }

 IEnumerator OnScoped()
 {
     yield return new WaitForEndOfFrame();
     go.SetActive(true);
 }

}