Why do the circles move together when I only mean to move one? C++/SFML

See more:

C++

Hey guys, I've been 'playing around' with SFML, I'm a beginner, I don't know what I want my final result to be, probably two players trying to get each others in the black hole, but right now, I just want to move the circles on turns, but the circles move together, why is that?
UPDATE: I changed the code, now only one circle can move, the turns don't change, please help. Here is the new code:-

#include <iostream>
#include <SFML/Graphics.hpp>
int playerRound = 1;
int n = 1;

int turn(){
	n++;
		if (n % 2 == 0){
			playerRound = 1;
			
		}
		else if (n%2!=0){
			playerRound = 2;

		}
	
	
	return playerRound;
	
}
int main(){



	sf::VideoMode videomode(400, 400);
	sf::RenderWindow window(videomode, "GAME");
	sf::CircleShape circle;
	circle.setFillColor(sf::Color::Red);
	circle.setPosition(100, 100);
	circle.setRadius(20);
	sf::CircleShape circle2;
	circle2.setFillColor(sf::Color::Yellow);
	circle2.setPosition(200, 200);
	circle2.setRadius(20);
	sf::CircleShape circle3;
	circle3.setFillColor(sf::Color::Black);
	circle3.setPosition(300, 300);
	circle3.setRadius(50);


	while (window.isOpen()){
		window.clear(sf::Color::Blue);
		window.draw(circle);
		window.draw(circle2);
		window.draw(circle3);

		window.display();

		sf::Event event;
		while (window.pollEvent(event))
		{
			if (event.type == sf::Event::Closed)
				window.close();
		}


		turn();
		
			if (playerRound == 1){

				if ((event.type == sf::Event::KeyPressed) && (event.key.code == sf::Keyboard::Up)){
					circle.move(0, -0.5);
					
					
				}

				else if ((event.type == sf::Event::KeyPressed) && (event.key.code == sf::Keyboard::Down)){
					circle.move(0, 0.5);
					
					
				}

				else if ((event.type == sf::Event::KeyPressed) && (event.key.code == sf::Keyboard::Right)){
					circle.move(0.5, 0);
					
				

				}

				else if ((event.type == sf::Event::KeyPressed) && (event.key.code == sf::Keyboard::Left)){
					circle.move(-0.5, 0);
					
					



				}
				turn();
			}
			else if (playerRound == 2)
			{
				if ((event.type == sf::Event::KeyPressed) && (event.key.code == sf::Keyboard::Up)){
					circle2.move(0, -0.5);
					
					
				}


				else if ((event.type == sf::Event::KeyPressed) && (event.key.code == sf::Keyboard::Down)){
					circle2.move(0, 0.5);
					
					
				}


				else if ((event.type == sf::Event::KeyPressed) && (event.key.code == sf::Keyboard::Right)){
					circle2.move(0.5, 0);
					
					
				}


				else if ((event.type == sf::Event::KeyPressed) && (event.key.code == sf::Keyboard::Left)){
					circle2.move(-0.5, 0);
					
					
				}

				turn();




			}
		}

	}


}

What I have tried:

I've tried changing the big if loops to while loops, I've also tried removing some braces, I've tried using sf::Keyboard::isKeyPressed.... instead, but nothing has worked so far, could you please help me? Thanks in advance :) [I'm a beginner btw, so excuse me]