Problem in multi touch

Hello,

I have two code for multi touch and according to my understanding both codes should behave same but in actual they are behaving different.I have defined a Rect which will show a texture at the bottom of screen.

 Rect jump_rect;
 
 void Start ()
 {
  jump_rect= new Rect(Screen.width*0.4f,Screen.height*0.85f,Screen.width*0.1f,Screen.height*0.1f);
 }

Here is 1st code

  if(Input.touchCount>0)
     {
             for(int i=0;i< Input.touchCount;i++)
             {
              
              Vector3   inputGuiPosition = Input.GetTouch(i).position;
                inputGuiPosition.y = Screen.height - inputGuiPosition.y;
                if(jump_rect.Contains(inputGuiPosition))
                {
              
              //do Something
  
                }
     
             }    
         }

1st code is working fine. jump_rect position and touch position are aligned and working fine.But problem lies in 2nd code and according to my understanding 2nd code should behave like 1st code.

Here is 2nd code

  if(Input.touchCount>0)
 {
         for(int i=0;i< Input.touchCount;i++)
         {  
       Touch touch=Input.GetTouch(i);
        touch.position.y=Screen.height-touch.position.y;
        
            if(jump_rect.Contains(touch.position))
            {
          
           //Do something
          
            }          
     }
                    
 }

But in 2nd code jump_rect and touch position are not aligned. When i click at top of screen jump_rect.Contains(touch.position) returns true.

please tell me whats the difference between 1st and 2nd code.. and why jump_rect.Contains(touch.position) is returning true when i click top of screen.