UI - Assigning Event Callbacks Via Script Fails on GameObjects Instantied Via Script

So I have a pretty basic tower defense game going on, there are set build points each with their own mini canvas UI for building and upgrading towers. Once you build a tower on them, they disappear and I instantiate a tower prefab with the new UI setup for upgrading said tower. Now, if I have a tower pre placed in the scene all the calls to the UI button events (set up via script) work just fine, however for whatever reason on a cloned object although all the setup script is still being called (I checked with debug statements) the events will not be called. I'm almost certain this is a bug, I'm using the latest stable version of Unity (5.3.4f1), I have my canvas set up correctly and there is an EventSystem object in the scene. Here is the button event setup script I use (it's a component on the button itself which is a child of the popup obejct on the Canvas which is a child of the actual tower object.

 using UnityEngine;
 using UnityEngine.Events;
 using UnityEngine.EventSystems;
 using System.Collections;
 
 public class UpgradeButtonSetup : MonoBehaviour {
     public string buttonType = "";
     private AttackCollector ac;
     private Collector c;
     private UnityEvent eButtonDown;
     // Use this for initialization
     void Awake () {
         Debug.Log("Setting up");
         eButtonDown = new UnityEvent();
     //    eButtonUp = new UnityEvent();
         EventTrigger trigger = gameObject.GetComponent<EventTrigger>();
         EventTrigger.Entry entry = new EventTrigger.Entry();
         ac = transform.parent.parent.parent.GetComponent<AttackCollector>();
 
         if(ac == null){
             Debug.Log(transform.parent.parent.parent);
             c = transform.parent.parent.parent.GetComponent<Collector>();
 
             switch(buttonType){
                 case "hp":
                     eButtonDown.AddListener(c.UpgradeHp);
                     break;
                 case "resource":
                     eButtonDown.AddListener(c.UpgradeResourceGen);
                     break;
                 default:
                     eButtonDown.AddListener(c.UpgradeHp);
                     break;
             }
 
         }
         else{
             switch(buttonType){
                 case "hp":
                     eButtonDown.AddListener(ac.UpgradeHP);
                     break;
                 case "attkspeed":
                     eButtonDown.AddListener(ac.UpgradeAttackSpeed);
                     break;
             }
         }
 
         entry.eventID = EventTriggerType.PointerDown;
         entry.callback.AddListener((eventData) => {ButtonDown();});
         trigger.triggers.Add(entry);
 
     }
 
 
     void ButtonDown(){
         eButtonDown.Invoke();
     }
 }