I need help with fixing my "up special" mechanic.

Recently i learnt how to make a double jump mechanic, and i wanted to challenge myself and create a up-special one. But for some weird reason i can do 2 up-specials after each other which is quite annoying.

Important variables public float jumpForce;

 public bool isGrounded;
 public Transform groundCheck;  
 
 private int extraJumps;
    public int extraJumpValue = 1;
 
  private bool LookUp;
     private int AmountOfUpSpecial;
     public int AmountOfUpSpecialValue;
 

Void start function

 void start()
     {
         extraJumpValue  = 1;
         extraJumps = extraJumpValue;
 
         AmountOfUpSpecialValue = 1;
         AmountOfUpSpecial = AmountOfUpSpecialValue;
 
         rb = GetComponent<Rigidbody2D>();
     }

My fixed Update function(dont think its that important)

  void FixedUpdate()
     {
 
         
         //Player 1 movement
 
         isGrounded = Physics2D.OverlapCircle(groundCheck.position, checkRadius, whatIsGround);
         
         if (P1 == true)
         {
         if (Input.GetKey("d"))
         {
             if(isGrounded == false)
             {
                 moveInput = 1;
                 rb.velocity = new Vector2(moveInput * speed / 1.4f, rb.velocity.y);
             }
             else if (isGrounded == true)
             {
                  moveInput = 1;
                  rb.velocity = new Vector2(moveInput * speed, rb.velocity.y);
             }
         }
         else
         {
             rb.velocity = new Vector2(0, rb.velocity.y);
         }
 
         if (Input.GetKey("a"))
         {
                 if(isGrounded == false)
             {
                 moveInput = -1;
                 rb.velocity = new Vector2(moveInput * speed / 1.4f, rb.velocity.y);
             }
             else if (isGrounded == true)
             {
                  moveInput = -1;
                  rb.velocity = new Vector2(moveInput * speed, rb.velocity.y);
             }
         }
 
 
         }
 
             //Player 2 movemt
 
         if (P1 == false)
         {
         if (Input.GetKey("right"))
         {
                 if(isGrounded == false)
             {
                 moveInput = 1;
                 rb.velocity = new Vector2(moveInput * speed / 1.4f, rb.velocity.y);
             }
             else if (isGrounded == true)
             {
                  moveInput = 1;
                  rb.velocity = new Vector2(moveInput * speed, rb.velocity.y);
             }
         }
         else
         {
             rb.velocity = new Vector2(0, rb.velocity.y);
         }
 
         if (Input.GetKey("left"))
         {
                 if(isGrounded == false)
             {
                 moveInput = -1;
                 rb.velocity = new Vector2(moveInput * speed / 1.4f, rb.velocity.y);
             }
             else if (isGrounded == true)
             {
                  moveInput = -1;
                  rb.velocity = new Vector2(moveInput * speed, rb.velocity.y);
             }
         }
         }
         //Flip function
         if (facingRight == false && moveInput > 0)
         {
                 Flip();
         }
          else if (facingRight == true && moveInput < 0)
         {
             Flip();
         }
     }

My Update function + my ground == true function.

 void Update()
     {
         //Moves
 
         //Up special
     if(P1 == true)
     {
          if(Input.GetKey("w"))
         {
             LookUp = true;
         }
         else
         {
             LookUp = false;
         }
     }
     if (P1 == false)
     {
          if(Input.GetKey("up"))
         {
             LookUp = true;
         }
         else
         {
             LookUp = false;
         }
     }
 
         //Jumping
         if (P1 == true)
         {
             if(Input.GetKeyDown(KeyCode.Space))
             {
                 if(LookUp == true && AmountOfUpSpecial > 0)
                 {
                     rb.velocity = Vector2.up * jumpForce * 2;
                     AmountOfUpSpecial = 0;
                     extraJumps = 0;
                 }
                 else if (LookUp == false  && extraJumps > 0)
                 {
                     rb.velocity = Vector2.up * jumpForce;
                     extraJumps =- 1;
                 }
                 else
                 {
                     print("You cant jump!");
                 }
             }
         }
         else if (P1 == false)
         {
             if(Input.GetKeyDown(KeyCode.I))
             {
                 if(LookUp == true && AmountOfUpSpecial > 0)
                 {
                     rb.velocity = Vector2.up * jumpForce * 2;
                     AmountOfUpSpecial -= 1;
                 }
                 else if (LookUp == false  && extraJumps > 0)
                 {
                     rb.velocity = Vector2.up * jumpForce;
                     extraJumps--;
                 }
             }
         }
 
 
         
         if(isGrounded == true)
         {
             extraJumps = extraJumpValue;
             AmountOfUpSpecial = AmountOfUpSpecialValue;
         }
     }

If you need any more info i can provide, and yes i am new to game dev.