Shooting and reloading mechanism problem.

Maybe at first I should show my script and explain the problem. Okay, so the problem is shooting like 100 times per second. Not literally but It's like super rapid fire gun. When I shoot, the current ammo (30/120, 29/120, 28/120 and so on) goes down till It's -99 or so and then immediately goes back to about -10, slows down and starts to reduce again to -99 and it goes like that forever. The total ammo which is in this case 120 is always the same. The reload coroutine works but I can shoot while reloading and then the ammo resets to 30 here but it does not stop going down and down.

The script looks like this:

 private void Update()
     {
         if (Input.GetKeyDown(KeyCode.R))
         {
             StartCoroutine(Reload());
         }
     }
 
     IEnumerator Reload()
     {
             canShoot = false;
             yield return new WaitForSeconds(2);
             gameManager.GetComponent<GameManager>().AmmoCurrent.text = ammoReload.ToString();
             ammoCurrentInt = ammoReload;
             canShoot = true;
     }
 
 public void Shoot()
     {
         if (isShooting && ammoCurrentInt == 0 && canShoot == false)
             return;
 
         isShooting = true;
         GameObject flash = Instantiate(FlashEffect, Vector3.zero, Quaternion.identity);       
         flash.transform.SetParent(BulletEmiter);
         flash.transform.localPosition = Vector3.zero;
         flash.transform.localRotation = BulletEmiter.localRotation;
 
 
         ammoCurrentInt--;
         gameManager.GetComponent<GameManager>().AmmoCurrent.text = ammoCurrentInt.ToString();
 
 
         SoundSource.PlayOneShot(ShootSound);
 
         Debug.DrawRay(Camera.main.transform.position, Camera.main.transform.forward * 200f, Color.red, 2f);
 
         RaycastHit hit;
         if (Physics.Raycast(Camera.main.transform.position, Camera.main.transform.forward, out hit, 200f))
         {
             HitDetected(hit);
         }
         StartCoroutine(AutoFire());
     }
     IEnumerator AutoFire()
     {
         yield return new WaitForSeconds(shootDelay);
         isShooting = false;
     }

Okay, maybe now I should describe some of my variables as they can be confusing.

ammoReload is int, It's used to reload the gun and It's never changed. It's set to ammoCurrentInt which is the variable to display ammo which is left on the screen.

When you reload you can't shoot that is why I made canShoot variable. The coroutine AutoFire() is to make delays between shots.

If It's understable then sorry for this quite long explanation. I just made it because I wouldn't understand it if someone showed me this lol.