Unity clones to a certain point (1, 3)

 for (int i = 0; i < 6; i++)
        {
            float a = Random.Range(1, 3);
            Vector2 b = Random.insideUnitCircle;
            Vector2 c = b.normalized;
            Vector3 d = new Vector3(transform.position.x+c.x*a, transform.position.y, transform.position.z+c.y*a);
            Instantiate(nurse, d,Quaternion.Euler(0,90,0));
        }