Unity Interactable = False suddenly not working - button

Question

now i encountered a very very weird issue. below is the code. pardon the length. This class has multiple function that were working when there only 3 (upt to button C)buttons being reference, in fact the one installed on my phone has the already pressed button disabled after i go back to the initial scene.
So me thinking all is good decided to do this for all the buttons that I have on my initial Screen. But for some reason it is not working, it is not disabling the buttons anymore. I have the GameLogic.cs where i have my variables declared and this script as well. 16 buttons = 16 Alphabets. So basically it just increments a value once button is pressed then once we go back to the initial screen On update, if the value is >= 1 then that particular button must be disabled.
Again it is working when i first built it for the phone. it is there. this is so weird. Maybe you can see some issue with the code here perhaps?
Thanks.
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
public class forButtonDisabler : MonoBehaviour {
public Button buttonA;
public Button buttonB;
public Button buttonC;
public Button buttonD;
public Button buttonE;
public Button buttonF;
public Button buttonG;
public Button buttonH;
public Button buttonI;
public Button buttonJ;
public Button buttonK;
public Button buttonL;
public Button buttonM;
public Button buttonN;
public Button buttonO;
public Button buttonP;
void OnEnable()
{
//Register Button Events
buttonA = GameObject.Find("btn5ptsPP").GetComponent<Button>();
buttonB = GameObject.Find("btn5ptsDP").GetComponent<Button>();
buttonC = GameObject.Find("btn5ptsTE").GetComponent<Button>();
buttonD = GameObject.Find("btn5ptsTA").GetComponent<Button>();
buttonE= GameObject.Find("btn10ptsPP").GetComponent<Button>();
buttonF = GameObject.Find("btn10ptsDP").GetComponent<Button>();
buttonG = GameObject.Find("btn10ptsTE").GetComponent<Button>();
buttonH = GameObject.Find("btn10ptsTA").GetComponent<Button>();
buttonI = GameObject.Find("btn15ptsPP").GetComponent<Button>();
buttonJ = GameObject.Find("btn15ptsDP").GetComponent<Button>();
buttonK = GameObject.Find("btn15ptsTE").GetComponent<Button>();
buttonL = GameObject.Find("btn15ptsTA").GetComponent<Button>();
buttonM = GameObject.Find("btn20ptsPP").GetComponent<Button>();
buttonN = GameObject.Find("btn20ptsDP").GetComponent<Button>();
buttonO = GameObject.Find("btn20ptsTE").GetComponent<Button>();
buttonP = GameObject.Find("btn20ptsTA").GetComponent<Button>();
buttonA.onClick.AddListener(() => buttonCallBack(buttonA));
buttonB.onClick.AddListener(() => buttonCallBack(buttonB));
buttonC.onClick.AddListener(() => buttonCallBack(buttonC));
buttonD.onClick.AddListener(() => buttonCallBack(buttonD));
buttonE.onClick.AddListener(() => buttonCallBack(buttonE));
buttonF.onClick.AddListener(() => buttonCallBack(buttonF));
buttonG.onClick.AddListener(() => buttonCallBack(buttonG));
buttonH.onClick.AddListener(() => buttonCallBack(buttonH));
buttonI.onClick.AddListener(() => buttonCallBack(buttonI));
buttonJ.onClick.AddListener(() => buttonCallBack(buttonJ));
buttonK.onClick.AddListener(() => buttonCallBack(buttonK));
buttonL.onClick.AddListener(() => buttonCallBack(buttonL));
buttonM.onClick.AddListener(() => buttonCallBack(buttonM));
buttonN.onClick.AddListener(() => buttonCallBack(buttonN));
buttonO.onClick.AddListener(() => buttonCallBack(buttonO));
buttonP.onClick.AddListener(() => buttonCallBack(buttonP));
}
private void buttonCallBack(Button buttonPressed)
{
if (buttonPressed == buttonA)
{
GameLogic.Cbtn1++;
}
if (buttonPressed == buttonB)
{
GameLogic.Cbtn2++;
}
if (buttonPressed == buttonC)
{
GameLogic.Cbtn3++;
}
if (buttonPressed == buttonD)
{
GameLogic.Cbtn4++;
}
if (buttonPressed == buttonE)
{
GameLogic.Cbtn5++;
}
if (buttonPressed == buttonF)
{
GameLogic.Cbtn6++;
}
if (buttonPressed == buttonG)
{
GameLogic.Cbtn7++;
}
if (buttonPressed == buttonH)
{
GameLogic.Cbtn8++;
}
if (buttonPressed == buttonI)
{
GameLogic.Cbtn9++;
}
if (buttonPressed == buttonJ)
{
GameLogic.Cbtn10++;
}
if (buttonPressed == buttonK)
{
GameLogic.Cbtn11++;
}
if (buttonPressed == buttonL)
{
GameLogic.Cbtn12++;
}
if (buttonPressed == buttonM)
{
GameLogic.Cbtn13++;
}
if (buttonPressed == buttonN)
{
GameLogic.Cbtn14++;
}
if (buttonPressed == buttonO)
{
GameLogic.Cbtn15++;
}
if (buttonPressed == buttonP)
{
GameLogic.Cbtn16++;
}
}
void OnDisable()
{
//Un-Register Button Events
buttonA.onClick.RemoveAllListeners();
buttonB.onClick.RemoveAllListeners();
buttonC.onClick.RemoveAllListeners();
buttonD.onClick.RemoveAllListeners();
buttonE.onClick.RemoveAllListeners();
buttonF.onClick.RemoveAllListeners();
buttonG.onClick.RemoveAllListeners();
buttonH.onClick.RemoveAllListeners();
buttonI.onClick.RemoveAllListeners();
buttonJ.onClick.RemoveAllListeners();
buttonK.onClick.RemoveAllListeners();
buttonL.onClick.RemoveAllListeners();
buttonM.onClick.RemoveAllListeners();
buttonN.onClick.RemoveAllListeners();
buttonO.onClick.RemoveAllListeners();
buttonP.onClick.RemoveAllListeners();
}
// Update is called once per frame
void Update()
{
if (GameLogic.Cbtn1 >= 1)
{
buttonA.interactable = false;
}
if (GameLogic.Cbtn2 >= 1)
{
buttonB.interactable = false;
}
if (GameLogic.Cbtn3 >= 1)
{
buttonC.interactable = false;
}
if (GameLogic.Cbtn4 >= 1)
{
buttonD.interactable = false;
}
if (GameLogic.Cbtn5 >= 1)
{
buttonE.interactable = false;
}
if (GameLogic.Cbtn6 >= 1)
{
buttonF.interactable = false;
}
if (GameLogic.Cbtn7 >= 1)
{
buttonG.interactable = false;
}
if (GameLogic.Cbtn8 >= 1)
{
buttonH.interactable = false;
}
if (GameLogic.Cbtn9 >= 1)
{
buttonI.interactable = false;
}
if (GameLogic.Cbtn10 >= 1)
{
buttonJ.interactable = false;
}
if (GameLogic.Cbtn11 >= 1)
{
buttonK.interactable = false;
}
if (GameLogic.Cbtn12 >= 1)
{
buttonL.interactable = false;
}
if (GameLogic.Cbtn13 >= 1)
{
buttonM.interactable = false;
}
if (GameLogic.Cbtn14 >= 1)
{
buttonN.interactable = false;
}
if (GameLogic.Cbtn15 >= 1)
{
buttonO.interactable = false;
}
if (GameLogic.Cbtn16 >= 1)
{
buttonP.interactable = false;
}
}
}