SFML Gravity test bug

#include <SFML/Graphics.hpp>
#include <iostream>
//#include <ctime>
//#include <cstdlib>

int main()
{
    srand((unsigned)time(NULL));

    const int WINDOW_WIDTH = 960;
    const int WINDOW_HEIGHT = 540;

    //const double ACCEL_GRAVITY = 9.8;


    sf::RenderWindow Window;
    Window.create(sf::VideoMode(WINDOW_WIDTH, WINDOW_HEIGHT), "SFML Gravity", sf::Style::Close);
    Window.setVerticalSyncEnabled(true);

    sf::Texture brickTexture;
    sf::Sprite brickImage;
    if  (!brickTexture.loadFromFile("brick.png")) // 60x40 image
         { std::cout << "Error: Could not load brick image\n"; return -1; }
    else { std::cout << "Brick image loaded successfully\n"; }
    brickImage.setTexture(brickTexture);
    brickImage.setPosition(WINDOW_WIDTH/2, WINDOW_HEIGHT/2);
    brickImage.setOrigin(brickImage.getLocalBounds().width/2.0, brickImage.getLocalBounds().height/2.0);

    std::cout << "Local width bounds: " << brickImage.getLocalBounds().width << std::endl;
    std::cout << "Local image origin = (" << brickImage.getOrigin().x << ", " << brickImage.getOrigin().y << ")\n";


    bool freefall = true;
    int i = 1;
    while (Window.isOpen())
    {
        sf::Event event;
        while(Window.pollEvent(event))
        {
            switch(event.type)
            {
            case sf::Event::MouseButtonPressed:
                if (event.mouseButton.button == sf::Mouse::Left)
                {
                    brickImage.setPosition(event.mouseButton.x, event.mouseButton.y);
                    freefall = true;
                    i = 1;
                }

                break;

            case sf::Event::Closed:
                Window.close();
                break;

            }
        }
        if (brickImage.getPosition().y >= (WINDOW_HEIGHT - WINDOW_HEIGHT/10.0))
        {
            freefall = false;   // The position at which it stops falling is not constant
        }
        else if (freefall == true)
        {
            brickImage.move(0, i);
            i++;

        }


        //Window.clear();
        Window.draw(brickImage);

        Window.display();
    }

}