QTableView connected with QSqlTableModel flickers (scrolls to the bottom and returns)

Hello guys I have a problem using table view. I have a tableview connected with a QSqlTableModel. On its 2nd column I want to have check state to control the row's Status (active/inactive) but when I try to push the check box QTableView scrolls to the bottom and returns to it's previous position. Is there any solution?

    bool ProjectsModel::setData(const QModelIndex &index, const QVariant &value, int role)
    {
        if(index.column() == STATUS_INDEX) {
            QSqlRecord rec = this->record(index.row());
            QString qrstr;
     
            qrstr = (rec.field(index.column()).value().toInt() == 1) ? "update " + tableName() + " set Status=0 where BRACE_ID=" : "update " + tableName() + " set Status=1 where BRACE_ID=";
            qrstr += QString().setNum(index.row()+1);
     
            braceDatabase->exec(qrstr.toUtf8().constData());
            return true;
        }
     
        return false;
    }
     
    void DataBase::updateTablesSlot()
    {
        if(projectsModel)
            projectsModel->select();
        if(attributesModel)
            attributesModel->select();
        if(targetsModel)
            targetsModel->select();
    }
     
    void DataBase::exec(const std::string &querystr)
    {
    		QSqlQuery qr(db);
            qr.exec(querystr.c_str());
            //qDebug() <<"Command :" << querystr.c_str() << "-> "<< query->lastError().text();
            updateTables(); 
    }

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

    void paint( QPainter *painter,
                        const QStyleOptionViewItem &option,
                        const QModelIndex &index ) const;


    QWidget *createEditor( QWidget *parent,
                        const QStyleOptionViewItem &option,
                        const QModelIndex &index ) const;

    void setEditorData( QWidget *editor,
                        const QModelIndex &index ) const;

    void setModelData( QWidget *editor,
                        QAbstractItemModel *model,
                        const QModelIndex &index ) const;

    void updateEditorGeometry( QWidget *editor,
                        const QStyleOptionViewItem &option,
                        const QModelIndex &index ) const;

    mutable QCheckBox * theCheckBox;

private slots:

    void setData(bool val);


};

ui->myTable->setItemDelegateForColumn(5,new CheckBoxDelegate(ui->myTable));

enum CheckState {
        Unchecked,
        PartiallyChecked,
        Checked
    };

• Unchecked = 0
• PartiallyChecked = 1
• Checked = 2

bool ret = QSqlTableModel::setData(index, value == Qt::Checked ? 0 : 1, role);