I am trying to capture the coordinates of the cursor in a Windows application. While the coordinate for the position (0, 0) is displayed correctly in the upper left corner, the coordinates become more and more distorted the further I move away from it, so that instead of (600, 600) only (583, 560) is displayed in the lower right corner. Here is the code I’m using

#include <windows.h>
#include <stdio.h>

LRESULT MainWindowProcedure(HWND Window, UINT Message, WPARAM WParam, LPARAM LParam)
{
    switch (Message)
    {
        case WM_MOUSEMOVE:
        {
            POINT Cursor;
            GetCursorPos(&Cursor);
            ScreenToClient(Window, &Cursor);

            char Buffer[256];
            snprintf(Buffer, sizeof(Buffer), "X: %d, Y: %d n", Cursor.x, Cursor.y);
            OutputDebugStringA(Buffer);

        } break;
        case WM_DESTROY:
        {
            PostQuitMessage(0);
        } break;
        default:
        {
            return DefWindowProc(Window, Message, WParam, LParam);
        } break;
    }
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
        WNDCLASSEXA WindowClass = {0};

        WindowClass.cbSize = sizeof(WNDCLASSEXA);
        WindowClass.style = CS_HREDRAW | CS_VREDRAW;
        WindowClass.lpfnWndProc = MainWindowProcedure;
        WindowClass.hInstance = hInstance;
        WindowClass.lpszClassName = "WindowClass";

        if (RegisterClassExA(&WindowClass) != 0)
        {
            HWND Window = CreateWindowExA(0, "WindowClass", "Window", WS_OVERLAPPEDWINDOW | WS_VISIBLE, 
                CW_USEDEFAULT, CW_USEDEFAULT, 600, 600, 0, 0, hInstance, 0);
            if (Window != 0)
            {

                int Running = 1;
                while (Running) {

                    MSG Message;

                    while (PeekMessageA(&Message, 0, 0, 0, PM_REMOVE))
                    {
                        if (Message.message == WM_QUIT)
                        {
                            Running = false;
                            break;
                        }

                        TranslateMessage(&Message);
                        DispatchMessageA(&Message);
                    }

                }
            }
        }
}

I also tried GET_X_LPARAM and GET_Y_LPARAM from the Windowsx.h. The exact same problem. Does somebody have a clue, what the problem could be?