Why doesn't my slider change it's value to the selected block height?

Questions & Answers
1

This script is inside a prefab called block. All I’m trying to do is make my slider control a block’s height. There are 2 blocks. When I click on a block it’s supposed to change it’s color to red and the slider’s value changes to the block’s height. This is done successfully. But when I click on another block and click again on the initial block the slider’s height changes to the previous block’s height and the current block matches the previously clicked block’s height. I suspect the problem is in my Update function. Also if it helps, I can make more blocks during runtime that’s why I have to delegate the AdjustHeight function.

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

public class Block_Change_Behavior : MonoBehaviour {

private GameObject CurrentButtonHolder;
private GameObject tagBearer;
public GameObject slider;
public float height = 1f;

void Start () {

	slider = GameObject.FindWithTag ("Block_Height_Slider");

}

void OnMouseDown() {

	
	CurrentButtonHolder = GameObject.FindWithTag("Current_Button_Holder");

	if (CurrentButtonHolder.GetComponent<Current_Button_Variable_Script> ().currentButtonSelected == "Change") {

		if (GetComponent<Renderer> ().material.color == Color.red) {
			GetComponent<Renderer> ().material.color = Color.green;

		} 
		else if (GetComponent<Renderer>().material.color == Color.green) {
			
			GetComponent<Renderer> ().material.color = Color.red;

			slider.GetComponent<Slider> ().value = transform.localScale.x; // this only works the first time

			if (tagBearer == null) {
				tagBearer = GameObject.FindWithTag ("selected");
				if (tagBearer != null && tagBearer != this.gameObject) {
					//Debug.Log ("found tag bearer"); 
					tagBearer.transform.gameObject.tag = "not_selected";
					tagBearer.GetComponent<Renderer> ().material.color = Color.green;
				}
				tagBearer = null; 

			}
			
				transform.gameObject.tag = "selected";

		}
	} 
	else if (CurrentButtonHolder.GetComponent<Current_Button_Variable_Script> ().currentButtonSelected == "Delete") {
		//Delete itself
		Object.Destroy(this.gameObject);
	}
}

void Update () {

	//I suspect this is causing problems.
	if (transform.gameObject.tag == "selected") {

		slider.GetComponent<Slider> ().onValueChanged.AddListener (delegate {AdjustHeight (slider.GetComponent<Slider> ().value);});
		transform.localScale = new Vector3 (4, height, 4);
		transform.localRotation = Quaternion.Euler (0, 0, 0);

	}
		

}

public void AdjustHeight (float newHeight) {
	height = newHeight;
//		Debug.Log(newHeight);
}
	
}
2

slider.GetComponent ().value = transform.localScale.y: