Pick up code issue

Hi Everyone! I need a little help figuring out this code. For some reason with a collision my object doesn't dissapear/hide.

The code is below:

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

public class PlayerController : MonoBehaviour {

 public float speed;             //Floating point variable to store the player's movement speed.     
 public float jump;
  float moveVelocity;

      public Text countText;
     public Text winText;
     private int count;
        

 private Rigidbody2D rb2d;       //Store a reference to the Rigidbody2D component required to use 2D Physics.
 

//Grounded Vars bool grounded = true;

 // Use this for initialization
 void Start()
 {
     //Get and store a reference to the Rigidbody2D component so that we can access it.
     rb2d = GetComponent<Rigidbody2D> ();
     count = 0;
     SetCountText ();
     winText.text ="";
 }

void Update () { //Jumping if (Input.GetKeyDown (KeyCode.Space) || Input.GetKeyDown (KeyCode.UpArrow) || Input.GetKeyDown (KeyCode.Z) || Input.GetKeyDown (KeyCode.W)) { if(grounded) { GetComponent ().velocity = new Vector2 (GetComponent ().velocity.x, jump); } }

             moveVelocity = 0;
 
             //Left Right Movement
             if (Input.GetKey (KeyCode.LeftArrow) || Input.GetKey (KeyCode.A))
             {
                     moveVelocity = -speed;
             }
             if (Input.GetKey (KeyCode.RightArrow) || Input.GetKey (KeyCode.D))
             {
                     moveVelocity = speed;
             }
 
             GetComponent<Rigidbody2D> ().velocity = new Vector2 (moveVelocity, GetComponent<Rigidbody2D> ().velocity.y);
 
     }
     // // Check if Grounded
     void OnTriggerEnter2D()
     {
             grounded = true;
     }
     void OnTriggerExit2D()
     {
             grounded = false;
     }



 //FixedUpdate is called at a fixed interval and is independent of frame rate. Put physics code here.
 void FixedUpdate()
 {
     //Store the current horizontal input in the float moveHorizontal.
     float moveHorizontal = Input.GetAxis ("Horizontal");

     //Store the current vertical input in the float moveVertical.
     float moveVertical = Input.GetAxis ("Vertical");

     //Use the two store floats to create a new Vector2 variable movement.
        Vector3 movement = new Vector3 (moveHorizontal, 0.0f, moveVertical);

     //Call the AddForce function of our Rigidbody2D rb2d supplying movement multiplied by speed to move our player.
     rb2d.AddForce (movement * speed);

        // Update is called once per frame. this is where our physics code will go
    


     }

 

 //OnTriggerEnter2D is called whenever this object overlaps with a trigger collider.
 void OnTriggerEnter2D(Collider2D other) 
 {
     //Check the provided Collider2D parameter other to see if it is tagged "PickUp", if it is...
     if (other.gameObject.CompareTag("PickUp"))
             {
                  other.gameObject.SetActive(false);
             }
 }


     void SetCountText ()
     {
     countText.text ="countText:" + count.ToString();
     if (count>=12){
             winText.text= "You Win!";
     }
 }

}