QAbstractItemModel::match bug?

[Koyi]

I have a QCombobox wich model is a QSqlTableModel populated with a DataBase table:
Integer | String
=-=-=-=-=-=-=-=
|
=-=-=-=-=-=-=-=
0 | Normal
=-=-=-=-=-=-=-=
1 | Leve
=-=-=-=-=-=-=-=
2 | Moderado
=-=-=-=-=-=-=-=
3 | Severo
=-=-=-=-=-=-=-=

the combobox works finecombo.PNG
but when I try to set the value in combo acording with the database table, I use this code

void MyComboBox::setValor(QVariant myValue)
{
QModelIndexList myFinded=this->model()->match(this->model()->index(0,0),Qt::DisplayRole,myValue,5,Qt::MatchFlags(Qt::MatchExactly || Qt::MatchWrap));
 
this->setCurrentIndex(myFinded[0].row());
}

void MyComboBox::setValor(QVariant myValue)
{
QModelIndexList myFinded=this->model()->match(this->model()->index(0,0),Qt::DisplayRole,myValue,5,Qt::MatchFlags(Qt::MatchExactly || Qt::MatchWrap));

this->setCurrentIndex(myFinded[0].row());
}

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When myValue is 1, myFinded has 1 Index (corresponding to row 2)
When myValue is 2, myFinded has 1 Index (corresponding to row 3)
and so on
but when myValue is 0, myFinded has 2 Index (corresponding to row 0 and 1)
I don't understand why. Is this a bug? Or am I doing something wrong