when QTableview inserts a progressbar, it doesn't display in correct position

//
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QDebug>
MainWindow::MainWindow( QWidget* parent )

{
    initUI();

    initModel();

    initDelegate();

    timer = new QTimer();

    connect( timer, &QTimer::timeout, this, &MainWindow::download );

    timer->setInterval( 1000 );
    timer->start();
}

MainWindow::~MainWindow() {}

void MainWindow::initUI()
{
    this->setMinimumSize( QSize( 400, 200 ) );

    tableView = new QTableView();

    tableView->setEditTriggers( QAbstractItemView::NoEditTriggers );

    this->setCentralWidget( tableView );
}

void MainWindow::initModel()
{
    model = new QStandardItemModel();

    model->setColumnCount( 2 );

    model->setHeaderData( 0, Qt::Horizontal, "name" );
    model->setHeaderData( 1, Qt::Horizontal, "progress" );

    model->setItem( 0, 0, new QStandardItem( "test-0" ) );
    model->setItem( 0, 1, new QStandardItem( "18" ) );

    model->setItem( 1, 0, new QStandardItem( "test-1" ) );
    model->setItem( 1, 1, new QStandardItem( "3" ) );

    model->setItem( 2, 0, new QStandardItem( "test-2" ) );
    model->setItem( 2, 1, new QStandardItem( "69" ) );

    tableView->setModel( model );
}

void MainWindow::initDelegate()
{
    delegate = new ProgressBarDelegate();

    tableView->setItemDelegateForColumn( 1, delegate );
}

void MainWindow::download()
{
    for ( auto i = 0; i < model->rowCount(); i++ )
    {
        int value = model->index( i, 1 ).data().toInt();
        value++;

        model->setData( model->index( i, 1 ), value );
    }
}

//
#ifndef PROGRESSBARDELEGATE_H
#define PROGRESSBARDELEGATE_H

#include <QApplication>
#include <QItemDelegate>
#include <QModelIndex>
#include <QObject>
#include <QPainter>
#include <QProgressBar>

class ProgressBarDelegate : public QItemDelegate
{
    Q_OBJECT
public:
    ProgressBarDelegate( QObject* parent = 0 );

protected:
    // painting
    void paint( QPainter* painter, const QStyleOptionViewItem& option, const QModelIndex& index ) const override;
};

#endif  // PROGRESSBARDELEGATE_H

//
#include "progressbardelegate.h"
#include <QDebug>
ProgressBarDelegate::ProgressBarDelegate( QObject* parent ) : QItemDelegate( parent ) {}

void ProgressBarDelegate::paint( QPainter* painter, const QStyleOptionViewItem& option, const QModelIndex& index ) const
{

    if ( index.column() == 1 )
    {
        const QAbstractItemModel* item_model = index.model();

        QRect r = option.rect;

        QStyleOptionProgressBarV2 progress_bar_option;
        progress_bar_option.textAlignment = Qt::AlignCenter;
        progress_bar_option.rect          = r; 
        progress_bar_option.minimum       = 0;
        progress_bar_option.maximum       = 100;
        progress_bar_option.progress      = 87;

        QProgressBar progress_bar;

      
        QApplication::style()->drawControl( QStyle::CE_ProgressBar, &progress_bar_option, painter, &progress_bar );
    }
}