I’m developing a Java RPG where the boss menu lists the bosses of the dungeons in pages. Once the player chooses a dungeon, the second menu lists the available actions.

    String[]heroArr={"Alice", "Annie", "Charmander", "Charmeleon", "Charizard", 
            "Bob", "Jack", "Metapod", "Butterfree", "Weedle", 
            "Lily", "Lucy", "Pikachu", "Pidgeotto", "Pidgeot"};
    int currentPage = 0;
    int pageSize = 5;
    Scanner sc = new Scanner(System.in);
    while (true) {
        int startIndex = currentPage*pageSize;
        int endIndex = Math.min(startIndex+pageSize, heroArr.length);

        for (int i = startIndex; i < endIndex; i++) {
            System.out.println(heroArr[i]+ "(" + String.valueOf(i+1) + ")");
        }
        
        String input = sc.nextLine().trim();
        
        if (input.isEmpty()) {
            currentPage++;
            
            if (endIndex >= heroArr.length) {
                break;
            }
            continue;
        } else {
            int heroId = Integer.parseInt(input)-1;
            System.out.println("challenge "+heroArr[heroId]);
            while (true) {
                System.out.println("challenge begins! choose: 1(attack), 2(escape)");
                int usrSelectedIdx = sc.nextInt();
                if (usrSelectedIdx == 1) {
                    System.out.println("challenge succeeds! "+heroArr[heroId]+"'s fragment+1");
                } else if (usrSelectedIdx == 2) {
                    System.out.println("escaped");
                } else if (usrSelectedIdx == 9) {
                    // System.out.println();
                    currentPage = 0;
                    break;
                } else {
                    System.out.println("erro");
                }
            }
        }
    }

When the player launches the game and the boss menu is rendered for the first time, everything goes well.

The player chooses a boss to challenge and then attacks the boss. However, things go wrong when the player chooses 9 to go back to the boss menu. The game is supposed to render the first pageSize = 5 bosses, but it actually renders 10 bosses. How do I fix it?