Input lag on Andorid but not in Unity

I made a simple script to move an object on the X and Y axis. It works fine in Unity, but when I build it and run it on android I get lag, meaning that the object changes direction after a delay and not right when I press the button. The code I have:

   void FixedUpdate () {
         if (!isMoving)
             return;
         //Controls();
         Vector2 temp = new Vector2(transform.position.x + direction.x * speed * Time.deltaTime * 50, 
  transform.position.y + direction.y * speed * Time.deltaTime * 50);
         gameObject.transform.position = temp;
     }

This code is called when the left or right button is pressed and it simply changes the direction vector:

 public void Controls()
     {
 
         if (Input.GetKeyDown("left") || leftPressed)
         {            
             if (direction == new Vector2(0, 1))
             {
                 direction = new Vector2(-1, 0);
             }
             else if (direction == new Vector2(1, 0))
             {
                 direction = new Vector2(0, 1);            
             }
             else if (direction == new Vector2(0, -1))
             {
                 direction = new Vector2(1, 0);
             }
             else if (direction == new Vector2(-1, 0))
             {
                 direction = new Vector2(0, -1);
             }
 
         }
            
         else if (Input.GetKeyDown("right") || rightPressed)
         {            
             if (direction == new Vector2(0, 1))
             {
                 direction = new Vector2(1, 0);
             }
             else if (direction == new Vector2(1, 0))
             {
                 direction = new Vector2(0, -1);
             }
             else if (direction == new Vector2(0, -1))
             {
                 direction = new Vector2(-1, 0);
             }
             else if (direction == new Vector2(-1, 0))
             {
                 direction = new Vector2(0, 1);
             }
         }
 
         leftPressed = rightPressed = false;
        
 
 
 
     }