unifrom_int_distribution used wrong here? (my results seem not equally distributed)

i went into trying to draw a simple star map. For this i first calculate the x and y position for the stars. X and Y are within the range of width and height of the window.

This is my random number generating function:

    template<typename T>
    T getRandomNumberBetween(const T& Min, const T& Max)
    {
        std::random_device rd;
        std::default_random_engine generator{rd()};
        std::uniform_int_distribution<T> dist{Min, Max};
        return dist(generator);
    }

And i use it like this:

auto calculate_x_position = std::bind(inc::getRandomNumberBetween<sf::Uint32>, 0, W-1);
    auto calculate_y_position = std::bind(inc::getRandomNumberBetween<sf::Uint32>, 0, H-1);
x = calculate_x_position(); //...

But as i draw my map over and over again it seems to me that there is a pivot to where most stars tend to be. E.g. the majority of stars are in the upper half of my window.

Examples:

Am i using it wrong or having a wrong expectation here?... Because here it says:

This distribution produces random integers in a range [a,b] where each possible value has an equal likelihood of being produced.

Kind Regards