not sure why if statement not coming true! :'(

hey guys!

I picked up unity and C# 3 days ago! trying to learn as much as possible!

I've been stuck on this for a few hours now, i am following this tutorial to learn: Link

I've created a "TaskList.cs" script that includes the "states" of units:

 public enum TaskList {
 
     Gathering,
     Moving,
     Idle,
     Building,
     Attacking,
     Delivering
 }

and I have a code for the statements to change depending on the input a player gives:

 public class ObjectInfo : MonoBehaviour {
 
     public TaskList task;
     public ResourceManager RM;
 
     public NodeManager.ResourceTypes heldResourceType;
 
     // bools return false statements
     private bool moving = false;
     public bool isSelected = false;
     public bool isGathering = false;
     private bool mRunning = false;
 
     public string objectName;
 
     private NavMeshAgent agent;
     private Animator mAnimator;
 
     public int heldResource;
     public int maxHeldResource;
 
     public GameObject[] drops;
     GameObject targetNode;
 
     // Use this for initialization
     void Start () {
 
         StartCoroutine(GatherTick());
         agent = GetComponent<NavMeshAgent>();
         mAnimator = GetComponent<Animator>();
 
 
     }
     
     // Update is called once per frame
     void Update () {
 
         if(targetNode == null)
         {
             if(heldResource != 0)
             {
                 drops = GameObject.FindGameObjectsWithTag("Drops");
                 agent.destination = GetClosestDropOff(drops).transform.position;
                 drops = null;
                 task = TaskList.Delivering;
             }else
             {
                 task = TaskList.Idle;
             }
         }
 
         if(heldResource == maxHeldResource && isGathering)
         {
             isGathering = false;
             Debug.Log("Inventory is full! " + heldResource + "/" + maxHeldResource);
 
             //resources drop off
             drops = GameObject.FindGameObjectsWithTag("Drops");
             agent.destination = GetClosestDropOff(drops).transform.position;
             drops = null;
             task = TaskList.Delivering;
         }
 
 
         if (Input.GetMouseButtonDown(1) && isSelected)
         {
             RightClick();
         }
         if (agent.remainingDistance <= agent.stoppingDistance)
         {
             mRunning = false;
         }
         else
         {
             mRunning = true;
         }
         if (agent.remainingDistance <= agent.stoppingDistance && moving)
         {
             Debug.Log("Stopped!");
             moving = false;
         }
         mAnimator.SetBool("running", mRunning);
     }
 
     GameObject GetClosestDropOff(GameObject[] dropOffs)
     {
         GameObject closestDrop = null;
         float closestDistance = Mathf.Infinity;
         Vector3 position = transform.position;
 
         foreach(GameObject targetDrop in dropOffs)
         {
             Vector3 direction = targetDrop.transform.position - position;
             float distance = direction.sqrMagnitude;
             if(distance < closestDistance)
             {
                 closestDistance = distance;
                 closestDrop = targetDrop;
             }
         }
         return closestDrop;
 
     }
 
     public void RightClick()
     {
         Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
         RaycastHit hit;
 
         if(Physics.Raycast(ray, out hit, 100))
         {
             if(hit.collider.tag == "Ground")
             {
                 agent.destination = hit.point;
                 moving = true;
                 Debug.Log("Moving...");
                 task = TaskList.Moving;
             }else if(hit.collider.tag == "Resource")
             {
                 agent.destination = hit.collider.gameObject.transform.position;
                 Debug.Log("Harvesting...");
                 task = TaskList.Gathering;
             }
         }
             }
 
     public void OnTriggerEnter(Collider other)
     {
         GameObject hitObject = other.gameObject;
 
         if(hitObject.tag == "Resource" && task == TaskList.Gathering)
         {
             isGathering = true;
             hitObject.GetComponent<NodeManager>().gatherers++;
             heldResourceType = hitObject.GetComponent<NodeManager>().resourceType;
             targetNode = hitObject;
         }else if(hitObject.tag == "Drops" && task == TaskList.Delivering)
         {
             if (RM.iron >= RM.maxIron)
             {
                 task = TaskList.Idle;
             }else
             {
                 RM.iron += heldResource;
                 heldResource = 0;
                 task = TaskList.Gathering;
                 agent.destination = targetNode.transform.position;
             }
         }
     }
 
     public void OnTriggerExit(Collider other)
     {
         GameObject hitObject = other.gameObject;
         if(hitObject.tag == "Resource")
         {
             hitObject.GetComponent<NodeManager>().gatherers--;
             isGathering = false;
 
         }
     }
 
     IEnumerator GatherTick()
     {
         while (true)
         {
             yield return new WaitForSeconds(1);
             if (isGathering)
             {
                 heldResource++;
             }
         }
     }
 }

everything worked fine before I implemented the "TaskList". the way it was set up is: there was a "trigger zone" where if a mouse input was detected inside the area, isGathering would be set to true!

but when i added the "TaskList" it did not work anymore, the "Task" wouldn't change at all and would stay "idle"

thanks in advance guys!