Trying to access GUI.Label text

I'm trying to change the GUI.Label text in C# and it seems to be working fine; however, when attached to different objects it's almost like each object is creating a separate instance of the GUI.Label. Each click of a different object changes the text and clears it after the 5 second invoke as it should but clicking another object overlays the new text instead of clearing it...again as if it's creating a new instance. I had a version where I created the new protected Rect and set it in Start() but it was doing the same thing.

Does anyone know the C# dot reference to dynamically created GUI.Label items? or if it is creating instances of the same GUI.Label to basically clear all of them out before setting the text again? i tried searching but nothing seems to be coming up in reference to this. Would it be creating new instances of the GUI.Label or instances of the text inside?

Using 2 scripts EventManager.cs and inven.cs (where the onClick is called)

EventManager.cs

 using UnityEngine;
 using System.Collections;
 using UnityEngine.UI;
 
 public class EventManager : MonoBehaviour {
     protected string thisString = "";
     private GUIStyle myStyle = new GUIStyle();
     private RectOffset rctOff;
     private int textWidth = Screen.width - 50;
     private int textHeight = 10;
     protected int textBoxTop = 30;
 
     protected void displayMessage(string displayString, int lineCount) {
         thisString = displayString;
         textBoxTop = textHeight * lineCount;
         
         CancelInvoke();
         Invoke ("removeText", 5);
     }
     
     void removeText() {
         thisString = "";
     }
 
     void OnGUI() {
         Font thisFont;
         thisFont = Resources.Load<Font> ("Japonesa_0");
 
         myStyle.font = thisFont;
         myStyle.fontSize = 20;
         myStyle.normal.textColor = Color.white;
         myStyle.alignment = TextAnchor.MiddleCenter;
         myStyle.wordWrap = true;
         myStyle.fixedWidth = textWidth;
         myStyle.fixedHeight = textHeight;
         myStyle.name = "textBox";
 
         rctOff = GUI.skin.customStyles[0].overflow;
         myStyle.overflow = rctOff;
 
         GUI.Label (new Rect (Screen.width / 2 - textWidth / 2, textBoxTop, 100, 30), thisString, myStyle);
     }
 }
 

inven.cs using UnityEngine; using System.Collections;

 public class inven : EventManager {
 
     void OnMouseDown () {
         base.displayMessage ("You clicked " + this.name + " ~ " + Random.Range(-10.0F, 10.0F).ToString(), 1);
     }
 }