Mouse double click event confueses with key event

[Heero]

Hello,
I encounter a very strange issue when I am developing a desktop application with Qt5.5.0_mingw32 on Windows. I create a GUI application simply based on QWidget by QtCreator wizard. And I just add the following lines:

void Widget::keyPressEvent(QKeyEvent *event)
{
qDebug() << event->modifiers() << "," << event->key();
}

void Widget::mouseDoubleClickEvent(QMouseEvent *event)
{
qDebug() << "mouse double click";
}

Then I run the demo and double click left mouse button. The result output is:
mouse double click
QFlagsQt::KeyboardModifiers(ControlModifier) , 16777249
QFlagsQt::KeyboardModifiers(ControlModifier) , 67

It should not generate key press event, right?
So how can I to avoid this? Or is there anything wrong I have done?

Thank you!

[alex_malyu]

It looks like one of the key it determined as pressed is Qt::Key_End
Are you sure you do not have it pressed?

[Heero]

Hello alex_malyu,
Thanks for your quick reply.
I'm sure I don't have it pressed. Only when I double click mouse button, it does these output.