Platformer crates(boxes) collision bug

Hi, I have problem with collision my character and crates, problem is when I jump on first crate I can do double jump, but when I touch the crate above the first crate I can do double jump again. I tried OnTriggerStay2D but it's working same as OnTriggerEnter2D, the crated doesn't have Rigidbody2D just BoxCollider2D, so I need to know how to jump just when I touch the top of the crates. You can see my level on image.

 //Player
     public static int health;
     public float speed;
     public float climbSpeed;
     public float jumpForce;
     public float doubleJumpForce;
     public bool doubleJump;
     private float climbVelocity;
     public Rigidbody2D rb2;
     private bool isClimbing;
     //Teleport
     public Transform Teleport1;
     private bool teleported1;
     public Transform Teleport2;
     private bool teleported2;
     //UI
     public Text healthTxt;
     //Other
     private float gravityScaleSave;    
     //Ladders
     private bool ladder2Touch;
     //Ground
     public bool grounded;
     public BoxCollider2D floor1;
     public BoxCollider2D floor2;
     //Box
     public bool boxGround;
     //Keys
     private bool redKey;
     private bool blueKey;
 
     // Use this for initialization
     void Start () {
         healthTxt = GameObject.Find ("HealthShow").GetComponent<Text> ();
         health = 100;
         blueKey = false;
         gravityScaleSave = rb2.gravityScale;
         rb2 = GetComponent<Rigidbody2D> ();
         rb2.freezeRotation = true;
 
 
     }
     
     // Update is called once per frame
     void Update () {
         healthTxt.text = "Health: " + health;
         //move
         var move = new Vector3 (Input.GetAxis ("Horizontal"), 0, 0);
         transform.position += speed * move * Time.deltaTime;
         if (Input.GetKeyDown (KeyCode.W) && grounded == true && boxGround == false) {
             rb2.AddForce(Vector2.up * jumpForce,ForceMode2D.Impulse);
             doubleJump = true;
         }
         if (Input.GetKeyDown (KeyCode.W) && grounded == false && boxGround == false) {
             if(doubleJump == true){
             rb2.AddForce(Vector2.up * doubleJumpForce,ForceMode2D.Impulse);
                 doubleJump = false;
             }
         }
         if (Input.GetKeyDown (KeyCode.W) && boxGround == true && grounded == false) {
             rb2.AddForce(Vector2.up * jumpForce,ForceMode2D.Impulse);
             doubleJump = true;
         }
         if (Input.GetKeyDown (KeyCode.W) && boxGround == false && grounded == false) {
             if(doubleJump == true){
                 rb2.AddForce(Vector2.up * doubleJumpForce,ForceMode2D.Impulse);
                 doubleJump = false;
             }
         }
         //climbing
         if (isClimbing == true) {
             if(ladder2Touch == true) {
             floor2.isTrigger = false;
             } else {
             floor2.isTrigger = true;
             }
             floor1.isTrigger = true;
 
             rb2.gravityScale = 0;
             climbVelocity = climbSpeed * Input.GetAxisRaw ("Vertical");
             rb2.velocity = new Vector2 (rb2.velocity.x, climbVelocity);
         } else {
             floor1.isTrigger = false;
             floor2.isTrigger = false;
 
             rb2.gravityScale = gravityScaleSave;
         }
     }
 
     public void OnTriggerEnter2D(Collider2D coll) {
 
         if (coll.gameObject.name == "Ladder1") {
             isClimbing = true;
 
         }
         if (coll.gameObject.name == "Ladder2") {
             isClimbing = true;
             ladder2Touch = true;    
             floor2.isTrigger = false;
 
         }
         if (coll.gameObject.name == "blueKey") {
             blueKey = true;
             Destroy(GameObject.Find("blueKey"));
         }
         if (coll.gameObject.name == "redKey") {
             redKey = true;
             Destroy(GameObject.Find("redKey"));
         }
         if (coll.gameObject.name == "spikes") {
             health -= 10;
         }
         if (coll.gameObject.name == "Teleport1") {
             StartCoroutine(Tel1(1F));
             if (teleported1 == false){
                 transform.position = Teleport2.transform.position;
                 teleported2 = true;
             }
             
         }
         if (coll.gameObject.name == "Teleport2") {
             StartCoroutine(Tel1(1F));
             if (teleported2 == false){
                 transform.position = Teleport1.transform.position;
                 teleported1 = true;
             }
             
         }
 
     }
     public void OnTriggerExit2D(Collider2D coll) {
         if (coll.gameObject.name == "Ladder1") {
             isClimbing = false;
 
         }
         if (coll.gameObject.name == "Ladder2") {
             isClimbing = false;
             ladder2Touch = false;
             floor2.isTrigger = false;
 
         }
         if (coll.gameObject.name == "Teleport1") {
             teleported1 = false;
             
         }
         if (coll.gameObject.name == "Teleport2") {
             teleported2 = false;
         }
     }
     public void OnCollisionStay2D(Collision2D coll) {
         if (coll.gameObject.tag== "Ground") {
             grounded = true;
             floor2.isTrigger = false;
             boxGround = false;
         }
         if (coll.gameObject.tag == "Box") {
             boxGround = true;
             grounded = false;
         }
     }
     public void OnCollisionEnter2D (Collision2D coll) {
         if (coll.gameObject.tag== "Ground") {
             grounded = true;
         }
         if(coll.gameObject.name == "blueGate") {
             if (blueKey == true) {
                 Destroy(GameObject.Find("blueGate"));
             }
         }
         if(coll.gameObject.name == "redGate") {
             if (redKey == true) {
                 Destroy(GameObject.Find("redGate"));
             }
         }
 
         
 
     }
     public void OnCollisionExit2D (Collision2D coll) {
         if (coll.gameObject.tag == "Ground") {
             grounded = false;
             boxGround = false;
         }
         if (coll.gameObject.tag == "Box") {
             boxGround = false;
 
         }
     }
      IEnumerator Tel1(float time) {
         yield return new WaitForSeconds(time);
         teleported1 = false;
     }
     IEnumerator Tel2(float time) {
         yield return new WaitForSeconds(time);
         teleported2 = false;
 
     }