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I started learning opencv and faced such a problem. When I load an ordinary picture and try to bring it to the screen, two windows are created in one image and in the other just a window with a gray background. If I use the C version, then everything works well (one window is created in which this image is located) What can be the problem. I downloaded the image download code from the documentation and in the example they create one window with a picture. Version of OpenCV 3.4

#include <opencv2/core.hpp>
#include <opencv2/imgcodecs.hpp>
#include <opencv2/highgui.hpp>

#include <iostream>
#include <string>
using namespace cv;
using namespace std;

int main(int argc, char** argv)
{
    Mat image = imread("image.jpg");  

    if (!image.data)                              
    {
        cout << "Could not open or find the image" << std::endl;
        cv::waitKey(5000);
        return -1;
    }

    namedWindow("Display window", WINDOW_AUTOSIZE);
    imshow("Display window", image);
    waitKey();
    system("pause");
    return 0;
}