Why does GetSystemMetrics() return these values?

I am having some issues creating a client area of a set size. AdjustWindowRect() won't work properly so I decided to try manually calculating the width and height of the window.

That didn't work either and I wondered why so I checked up the values I used to take in account the borders etc.

#include <iostream>
#include <Windows.h>

int main(void)
{
    std::cout << "GetSystemMetrics(SM_CYEDGE) = " << GetSystemMetrics(SM_CYEDGE) << std::endl;
    std::cout << "GetSystemMetrics(SM_CXEDGE) = " << GetSystemMetrics(SM_CXEDGE) << std::endl;
    std::cout << "GetSystemMetrics(SM_CYBORDER) = " << GetSystemMetrics(SM_CYBORDER) << std::endl;
    std::cout << "GetSystemMetrics(SM_CXBORDER) = " << GetSystemMetrics(SM_CXBORDER) << std::endl;
    std::cout << "GetSystemMetrics(SM_CYCAPTION) = " << GetSystemMetrics(SM_CYCAPTION);

    std::cin.get();
}

This gives me:

GetSystemMetrics(SM_CYEDGE) = 2
GetSystemMetrics(SM_CXEDGE) = 2
GetSystemMetrics(SM_CYBORDER) = 1
GetSystemMetrics(SM_CXBORDER) = 1
GetSystemMetrics(SM_CYCAPTION) = 22

I am PRETTY sure that the borders of my window aren't that thin. What am I doing wrong?

EDIT 1:

Initially my window used the WS_OVERLAPPED style. Since the AdjustWindowRect does not allow that style to be used alongside it I constructed the same type of window I wanted with: (WS_BORDER | WS_CAPTION | WS_SYSMENU). This is the same style I use during the call to AdjustWindowRect and AdjustWindowRectEx(this one with NULL as extended style since I do not use any). This gives me the correct width but the height is missing a few pixels.

RECT rect = { 0, 0, 800, 600};

AdjustWindowRectEx( &rect, (WS_BORDER | WS_CAPTION | WS_SYSMENU), FALSE, NULL);

CreateWindowEx( ..., rect.right - rect.left, rect.bottom - rect.top, ...);

This gives me 800 pixels wide client-area but only 582 pixels in height.

EDIT 2:

CURIOUS, I used GetClientRect(); and it gave me that the width is 800 and the height IS 600. How come it doesn't display properly?

It seems that when I painted the whole window it all measured up. The reason? I don't know.

Maybe someone else can shed some light over this.