the this pointer set by Object(this) != this - c++

Question

the constructor for my engine constructs audio, video and input objects with a pointer to itself (this). However when I debug, I see all the classes I construct's enginePtr is not the same as the value of this provided by the debugger.
When I peek inside, I see for example, the enginePtr of pRender has different values than the engine. Most of them are set to NULL, which causes rendering to crash.
Here is my engine constructor:
cEngine::cEngine( int flag ) {
if ( !al_get_system_driver() ) {
this->isRunning = true;
al_init();
// Uses DirectX by default, uncomment ALLEGRO_OPENGL for OpenGL.
if ( flag == OPENGL_WINDOW || flag == OPENGL ) al_set_new_display_flags( ALLEGRO_RESIZABLE | ALLEGRO_OPENGL );
else if ( flag == DIRECTX_WINDOW || flag == DIRECTX ) al_set_new_display_flags( ALLEGRO_RESIZABLE );
else if ( flag == OPENGL_FULLSCREEN ) al_set_new_display_flags( ALLEGRO_FULLSCREEN | ALLEGRO_OPENGL );
else if ( flag == DIRECTX_FULLSCREEN ) al_set_new_display_flags( ALLEGRO_FULLSCREEN );
this->display = createDisplay( "Motherload C++", -1, -1, 640, 480 );
srand( ( unsigned ) time(0) );
pCam = new cCam( this );
pIO = new cIO( this );
pMap = new cMap( this, setPoint( 50, 50 ), setPoint( 13, 20 ) ); // 13, 20
pPlayer = new cPlayer( this );
pAudio = new cAudio( this );
pRender = new cRender( this );
pEvents = new cEvents( this );
}
}
cRender constructor:
cRender::cRender( cEngine* pEngine ) {
this->pPlayerLoc = pPlayerLoc;
this->BLACK = al_map_rgb(30, 100, 200);
this->needsRedraw = false;
this->pEngine = pEngine;
al_init_font_addon();
al_init_ttf_addon();
splitImages();
//this->font = al_load_font( "C:/resource/gisha.ttf", 24, 0 );
//this->img = al_load_bitmap( "C:/resource/rock.png" );
}
Thanks

Answer 1

It's very unlikely. Your code seems logically fine to me. Instead or relying on debugger, try to print out the value of 'this' and whatever you stored in pRenderer. Sometimes, with optimization flags debuggers do not show the values of variables properly.