qDebug print missplaced in run - not in code sequence

[Anonymous_Banned275]

I hope I do not get flamed for this post, but I need an answer.
I am using cout and qDebug to trace my code in real time.

The attached snippet of code supposedly print qDebug " SINGLE message" first , than cout next.

It does not, see attached console output.
On top of that - the qDebug messages are printed in reverse order.

I like to have some explanation why is that.

I actually prefer using cout , and this weird sequence of qDebug makes my way of tracing the code flaky thus unusable.
BUT if that is the way it works, I just won't use it.
Thanks

PS
Sorry for messy code , it is work in progress

   if(BT_string_list.size())
    {

        cout << "ENTRY ********************************************" << endl;
#ifdef DEBUG
        cout << endl;
        cout << "TRACE Current marker  " << __FUNCTION__ << endl;
        cout << "BT_string_list.size() OK           @line  list size  "
             << BT_string_list.size() << "  " << __LINE__ << endl;

        // exit(42);


        cout << "\033[1;31mRED COLOR START " << endl;
        cout << "\033[1;31mTRACE START \n";
        cout << "*** TRACE file " << __FILE__ << endl;
        cout << " function " << __FUNCTION__ << endl;
        cout << "COLOR END   \033[0m " << dec << __LINE__ << endl;
        //exit(0);

        // scan_agent->BTScan_TEST_Print(scan_agent->BTLocalDeviceInfo.name());

        // BT_string_list.s


        cout << "\033[1;32mGREEN COLOR START " << endl;
        cout << "\033[1;32mTRACE START \n";
        cout << "*** TRACE file " << __FILE__ << endl;
        cout << " function " << __FUNCTION__ << endl;
        cout << "COLOR END   \033[0m " << dec << __LINE__ << endl;


        //qDebug ("message %d, says: %s",num,str);


        cout << "***************************************function " << __FUNCTION__ << endl;


#ifdef DEBUG
        cout << "TRACE Current marker  " << __FUNCTION__ << endl;
        cout << "DEBUG HERE     @line " << __LINE__ << endl;
        cout << "function " << __FUNCTION__ << endl;
#endif

THIS GETS "DELAYED " IN PRINTING TO CONSOLE 
        qDebug() << "SINGLE DEBUG  message " << BT_string_list.size()<< ", says: "
                 << BT_string_list.at(0).name() << "@line " << __LINE__;


#ifdef DEBUG
        cout << "TRACE Current marker  " << __FUNCTION__ << endl;
        cout << "DEBUG HERE     @line " << __LINE__ << endl;
        cout << "function " << __FUNCTION__ << endl;
#endif
        //qDebug() << "DEBUG  message " << BT_string_list.size()<< ", says: " << BT_string_list.at(1).name();

PRINTS IN CORRECT SEQUENCE 

        cout << "cout test #1 " << BT_string_list.at(0).name().toStdString() << endl;
        cout <<"cout test #2 " << BT_string_list.at(0).name().toLocal8Bit().constData() << endl;


#ifdef DEBUG
        cout << "TRACE Current marker  " << __FUNCTION__ << endl;
        cout << "DEBUG HERE     @line " << __LINE__ << endl;
        cout << "function " << __FUNCTION__ << endl;
#endif


#endif

        cout << "EXIT ******************************************" <<endl;

    }
    else

***************************************function on_scan_pressed
TRACE Current marker  on_scan_pressed
DEBUG HERE     @line 182
function on_scan_pressed
TRACE Current marker  on_scan_pressed
DEBUG HERE     @line 189
function on_scan_pressed

PRINTS IN CORRECT SEQUENCE 

cout test #1 z-desktop
cout test #2 z-desktop
TRACE Current marker  on_scan_pressed
DEBUG HERE     @line 197
function on_scan_pressed
EXIT ******************************************
DEBUG  " scan_agent->BTScan_TEST_Print "  @line  24 

DEBUG  "z-desktop"  @line  24 

DELAYED AND IN REVERSE ORDER OF qDebug calls  

SINGLE DEBUG  message  1 , says:  "z-desktop" @line  186
/media/z/DOC_COPY_LABEL/Projects /QT_TEST/TEST_Splitter/application_1/build-application-Desktop-Debug/application exited with code 0

[Christian Ehrlicher]

I don't see what's wrong here - qDebug() and std::cout are two completely different things so why should the order between those two match when it is printed to stdout?