QGraphicsItem move influences other items in scene

[esotery]

Hello,

I have come across some behaviour of Scene (or maybe Item) that I don't like and I don't know how to get rid of it.

I have Scene with two items. They are both Movable and Selectable. They are stacked on each other and if I move the top Item to whatever direction, it will also move the other Item that is beneath it to opposite direction.

The code is really simple:

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent)
{
    QGraphicsScene* scene = new QGraphicsScene(this);
    QGraphicsView* view = new QGraphicsView(this);
    view->setScene(scene);
    view->setMinimumSize(400, 200);
 
    QGraphicsRectItem* item1 = new QGraphicsRectItem(0, 0, 50, 50);
    item1->setFlag(QGraphicsItem::ItemIsMovable, true);
    item1->setFlag(QGraphicsItem::ItemIsSelectable, true);
    QGraphicsRectItem* item2 = new QGraphicsRectItem(0, 0, 50, 50);
    item2->setFlags(item1->flags());
 
    scene->addItem(item1);
    scene->addItem(item2);
 
    setCentralWidget(view);
}

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent)
{
    QGraphicsScene* scene = new QGraphicsScene(this);
    QGraphicsView* view = new QGraphicsView(this);
    view->setScene(scene);
    view->setMinimumSize(400, 200);

    QGraphicsRectItem* item1 = new QGraphicsRectItem(0, 0, 50, 50);
    item1->setFlag(QGraphicsItem::ItemIsMovable, true);
    item1->setFlag(QGraphicsItem::ItemIsSelectable, true);
    QGraphicsRectItem* item2 = new QGraphicsRectItem(0, 0, 50, 50);
    item2->setFlags(item1->flags());

    scene->addItem(item1);
    scene->addItem(item2);

    setCentralWidget(view);
}

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I know it must be something stupid that I've overlooked.

Thank you for your help.

Small compilable example attached.