Issue with Instantiate and the instant that spawns on a moving object that rotates

This may be a very confusing question but I am having trouble with bullets spawning. the game is in 2D and when the player is moving the instant spawns left or right based on how it is moving I took a picture of it and ill post my bullet spawning code as well. I use C#.

here is the code, it doesn't have any error, but if the spawning has something to do with the movement here it is.

     if ((Input.GetKey(KeyCode.Mouse0) || (Input.GetKey(KeyCode.F))) && bulletAmount > 0 && timePerShot == 0 && transform.localScale.y != 1 && gun == true)
     {
         Rigidbody bulletInstance;
         var pos = Input.mousePosition;
         pos.z = transform.position.z - Camera.main.transform.position.z;
         pos = Camera.main.ScreenToWorldPoint(pos);
         var q = Quaternion.FromToRotation(Vector3.up, pos - transform.position);
         bulletInstance = Instantiate(bullet, gunBarrel.position, q) as Rigidbody;
         bulletInstance.AddForce(gunBarrel.right * speed);
         bulletAmount--;
         timePerShot += timeBetweenShots;
         audioSource.PlayOneShot(bulletSound, 2);
     }