Moving UI buttons with code

Hello, I'm attempting to move 4 UI buttons around on the same canvas at the start of a new level. There are 4 different fixed positions that they may go into. But for some reason every attempt to move them with code has ended in bizarre results.

For example, Button 1 "btn1" that I have setup, moves to -17258.24 , -26265.6 instead of 135.45f, -205.2f ,0f or any of the others listed below in my code. I have added a Debug.Log (pickPos[randomPos]); to check if it's receiving the correct transforms and it is.

I'm really stumped on this, could anyone help me out? Please take a look at my code below.

 using UnityEngine;
 using System.Collections;
 using UnityEngine.UI;
 
         public GameObject btn1 = null;
     public Text pick1;
     public GameObject btn2 = null;
     public Text pick2;
     public GameObject btn3 = null;
     public Text pick3;
     public GameObject btn4 = null;
     public Text pick4;
 
     public Vector3 pos1 = new Vector3(-134.83f,-205.2f,0f);
     public Vector3 pos2 = new Vector3(135.45f,-205.2f,0f);
     public Vector3 pos3 = new Vector3(-134.83f,-464.7f,0f);
     public Vector3 pos4 = new Vector3(135.45f,-464.7f,0f);
 
     public Vector3[] pickPos;
     public int randomPos;
 
     void Start ()
     {
         
         pickPos = new Vector3[4];
         pickPos[0] = pos1;
         pickPos[1] = pos2;
         pickPos[2] = pos3;
         pickPos[3] = pos4;
         randomPos = (int)Random.Range(0,4);
         btn1.transform.position = pickPos[randomPos];
 
     }