こんにちは。私は今イメージファイルで問題を出して答えを入力してもらうプログラムをDXLibで具現しています、
初心者なので機能を一つ追加するたびに困っていますが、現在は画面の切り替えに困っています。
ボタンを押すと画面が切り替わりたいのですが、2番目の画面が点滅します。 手伝ってもらえますか？
足りないコードを添付してみます。


main.cpp:
#include "DxLib.h"
#include "SCENE.h"
#include "PROBLEMSOLVER.h"

int WINAPI WinMain(HINSTANCE, HINSTANCE, LPSTR, int)
{
    ChangeWindowMode(TRUE);
    if (DxLib_Init() == -1)
    {
        return -1;
    }


    while (ScreenFlip() == 0 && ProcessMessage() == 0 && ClearDrawScreen() == 0)
    {
        switch (currentScene) {
        case SCENE_FIRST:
            FirstScreen();
            break;

        case SCENE_SECOND:
            SecondScreen();
            break;

        case SCENE_THIRD:
            ThirdScreen();
            break;

        case SCENE_FOURTH:
        case SCENE_FIFTH:
        case SCENE_SIXTH:
        case SCENE_SEVENTH:
        case SCENE_EIGHTH:
        case SCENE_NINTH:
            break;

        default:
            break;
        }

        ScreenFlip();
    }

    DxLib_End();
    return 0;
}


Scene.cpp:
#include "DxLib.h"
#include "SCENE.h"
#include "PROBLEMSOLVER.h"

SceneType currentScene = SCENE_FIRST;

void ChangeScene(SceneType newScene) {
    currentScene = newScene;
}

void FirstScreen()
{
    int backgroundImage = LoadGraph("C:/Users/user/Desktop/source/repos/DXlib/Data/background.png");
    int bgX = 0, bgY = 0;
    int font = CreateFontToHandle("~", 30, 3, DX_FONTTYPE_EDGE);
    int buttonFont = CreateFontToHandle("~", 30, 3, DX_FONTTYPE_NORMAL);

    int img1 = LoadGraph("C:/Users/user/Desktop/source/repos/DXlib/Data/1.png");
    int img2 = LoadGraph("C:/Users/user/Desktop/source/repos/DXlib/Data/2.png");
    int x1 = 100, y1 = 200;
    int x2 = 500, y2 = 200;
    double angle = 0.0, scale = 0.5;

    int buttonX = 200;
    int buttonY = 200;
    int buttonWidth = 150;
    int buttonHeight = 80;

    const char* buttonText = "START!";

    DrawGraph(bgX, bgY, backgroundImage, TRUE); //배경
    DrawRotaGraph(x1, y1, scale, angle * DX_PI / 180, img1, 1);
    DrawRotaGraph(x2, y2, scale, angle * DX_PI / 180, img2, 1);
    DrawFormatStringToHandle(120, 150, GetColor(255, 255, 255), font, "~");
    DrawBox(buttonX, buttonY, buttonX + buttonWidth, buttonY + buttonHeight, GetColor(128, 128, 128), TRUE); 
    DrawStringToHandle(buttonX + 15, buttonY + 20, buttonText, GetColor(255, 255, 255), buttonFont); 

    if (GetMouseInput() & MOUSE_INPUT_LEFT) {
        ChangeScene(SCENE_SECOND);
    }
}


void SecondScreen()
{
    int s_backgroundImage = LoadGraph("C:/Users/user/Desktop/source/repos/DXlib/Data/background.png");
    int s_bgX = 0, s_bgY = 0;
    int s_font = CreateFontToHandle("~", 30, 3, DX_FONTTYPE_EDGE);
    int s_buttonFont = CreateFontToHandle("~", 20, 3, DX_FONTTYPE_NORMAL);

    struct ButtonInfo
    {
        int x;
        int y;
        int z;
        float radius;

        //int width;
        //int height;
        const char* text;
        bool clicked;
        int fontHandle;
    };

    DrawGraph(s_bgX, s_bgY, s_backgroundImage, TRUE);
    int mx = 0, my = 0, minput = 0, wheel = 0;
    int second_img1 = LoadGraph("C:/Users/user/Desktop/source/repos/DXlib/Data/3.png");
    int bgX = 0, bgY = 0;
    double angle = 0.0;

    ButtonInfo buttons[6];
    for (int i = 0; i < 6; ++i)
    {
        buttons[i].radius = 80;
        buttons[i].clicked = false;
        buttons[i].fontHandle = s_font;
        buttons[i].z = 0;
    }

    buttons[0].x = 150;
    buttons[0].y = 220;
    buttons[0].text = "~";

    buttons[1].x = 325;
    buttons[1].y = 220;
    buttons[1].text = "~";

    buttons[2].x = 500;
    buttons[2].y = 220;
    buttons[2].text = "~";

    buttons[3].x = 150;
    buttons[3].y = 350;
    buttons[3].text = "~";

    buttons[4].x = 325;
    buttons[4].y = 350;
    buttons[4].text = "~";

    buttons[5].x = 500;
    buttons[5].y = 350;
    buttons[5].text = "~";

    for (int i = 0; i < 6; ++i)
    {
        const ButtonInfo& button = buttons[i];

        DrawOvalAA(button.x, button.y, 80, 50, 32, GetColor(67, 116, 217), 1);
        DrawStringToHandle(button.x - 50, button.y - 15, button.text, GetColor(255, 255, 255), s_buttonFont);

        if (CheckHitKey(KEY_INPUT_0 + i)) {
            ChangeScene(static_cast<SceneType>(SCENE_THIRD + i));
        }
    }

    DrawRotaGraph(320, 110, 0.5, angle * DX_PI / 180, second_img1, 1);
}

void ThirdScreen()
{
    int C = GetColor(255, 255, 255);
    int TEST;

    DrawBox(270, 190, 370, 290, GetColor(255, 255, 255), TRUE);
    SetKeyInputStringColor(GetColor(0, 0, 0), GetColor(0, 0, 0), C, C, C, C, C, C, C, C, C, C, C, C, C, C, C);
    TEST = KeyInputNumber(270, 190, 100, 1, FALSE);
}