SFML key input and events?

[humble stag]

Hi im a beginner at SFML, making my first project which is a pong clone. This is what ive made so far and i just noticed some unintended behavior with the player paddle. It moves how its supposed to with my up and down arrow key, but if i press on random keys while holding down an arrow key, it makes my paddle pause for half a sec. I read the SFML tutorial but still dont know why, any help would be appreciated.

Here's a vid to show u what i mean

https://gyazo.com/031923d604a715262fa27d2ea19ec13f

[obsidian rapids]

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[humble stag]

#include <SFML/Graphics.hpp>
#include <iostream>
using namespace sf;
using std::cout;

int main() {
    // Create Window
    RenderWindow window(VideoMode({ 800, 600 }), "Pong", Style::Titlebar | Style::Close);
    window.setVerticalSyncEnabled(true);
    // Create Paddles
    RectangleShape player_paddle({ 14, 100 }); 
    RectangleShape opponent_paddle({ 14, 100 });
    player_paddle.setFillColor(Color::Yellow);
    opponent_paddle.setFillColor(Color::White);
    // Center paddles on sides of screen
    player_paddle.setPosition({ 786, 250 });
    opponent_paddle.setPosition({ 0, 250 });
    // Create ball
    CircleShape ball({ 5 }); // radius 5
    // Centers the ball in the window
    ball.setPosition({ 395, 295 });

    bool paddle_moving_up = false;
    bool paddle_moving_down = false;

    while (window.isOpen()) {
        while (const std::optional<Event> event = window.pollEvent()) {
            if (Keyboard::isKeyPressed(Keyboard::Key::Up)) {
                paddle_moving_up = true;
            }
            if (Keyboard::isKeyPressed(Keyboard::Key::Down)) {
                paddle_moving_down = true;
            }
            if (event->is<Event::Closed>())
                window.close();
        } 
        if (paddle_moving_up) {
            // check top window collision
            if (player_paddle.getPosition().y - 10 >= 0) {
                player_paddle.move({ 0, -10 });
            }
        }
        if (paddle_moving_down) {
            // check bottom window collision
            if ((player_paddle.getPosition().y + 100) + 10 <= 600) {
                player_paddle.move({ 0, 10 });
            }
        }
        paddle_moving_up = false; paddle_moving_down = false;
        window.clear();
        window.draw(player_paddle); window.draw(opponent_paddle);
        window.draw(ball);
        window.display();
    }
}

I just realized that if I:

hold up or down arrow key and then hold a random key - my paddle pauses for half a second and then continues moving

hold up or down arrow key and then press and release a random key - my paddle stops moving completely, until i release the arrow key and then hold it again