2D UI prefab instantiating wrong position, I can't instatiate my UI prefab in a specific point

I am trying to make a script that puts these UIs in a kind of "family" tree and that these UIs are added whenever the player wants to add a "family". After some trial and error, I noticed that even if I set the spawn coordinates to (x = 1, y = 1) the instantiation occurred in x = 407 and y = 213.

   var newparagrafo = Instantiate(alberoprefab, new Vector2((transform.position.x), (transform.position.y)), Quaternion.identity) as GameObject;
             newparagrafo.transform.SetParent(makebook, false);
             newparagrafo.transform.position = new Vector2(1, 1);

even the size is wrong (too big). any solution?