Cant Reset slider position

amonR

Hi there,
Here is my issue: when I reset the position of my slider it acts like if it's been moved while I just press on it.
Here is a part of my code:
@
WinA::WinA(FenPrincipale *FenPr, QWidget *parent) : QWidget(parent)
{

Couleur = new QLabel;
Hierar = new HierarchItem (FenPr, this);

boutonItem = new QSlider(Qt::Horizontal,this);
boutonItem->setGeometry(146,121,20,4);
boutonItem->setRange(0,100);
boutonItem->setValue(40);

labelH = new QLabel(Hierar);
labelH->move(71,102);
labelH->setStyleSheet("color: #C9C9C9;");
labelH2 = new QLabel(Hierar);
labelH2->move(200,102);
labelH2->setStyleSheet("color: #C9C9C9;");

QObject::connect(boutonItem, SIGNAL(sliderPressed()), this, SLOT(DisplayItem()));
QObject::connect(boutonItem, SIGNAL(valueChanged(int)), this, SLOT(SelectItem(int)));

}

void WinA::SelectItem(int posbH)
{
if(posbH==40)
{
//QObject::disconnect(boutonItem, SIGNAL(sliderReleased()), this, SLOT(TraitementLabelH()));
//QObject::disconnect(boutonItem, SIGNAL(sliderReleased()), this, SLOT(TraitementLabelH2()));
labelH->setStyleSheet("color: #C9C9C9;");
labelH2->setStyleSheet("color: #C9C9C9;");
}

if(posbH>40)
{
labelH->setStyleSheet(""+Couleur->text()+"");
labelH2->setStyleSheet("color: #C9C9C9;");
}

if(posbH<40)
{
labelH->setStyleSheet("color: #C9C9C9;");
labelH2->setStyleSheet(""+Couleur->text()+"");
}

if(posbH>90)
{
QObject::connect(boutonItem, SIGNAL(sliderReleased()), this, SLOT(TraitementLabelH()));
}

if(posbH<10)
{
QObject::connect(boutonItem, SIGNAL(sliderReleased()), this, SLOT(TraitementLabelH2()));
}

}

void WinA::TraitementLabelH()
{
this->close;
}

void WinA::TraitementLabelH2()
{
this->close;
}

void WinA::DisplayItem()
{
labelH->setText(Hierar->getlabelHier());
labelH2->setText(Hierar->getlabelHier2());

//Seconde Animation
QPropertyAnimation *animation = new QPropertyAnimation(labelH, "geometry");
animation->setDuration(153);
animation->setStartValue(QRect(138, 102, 60, 14));
animation->setEndValue(QRect(200, 102, 60, 14));
animation->start(QAbstractAnimation::DeleteWhenStopped);

//Seconde Animation
QPropertyAnimation *animation2 = new QPropertyAnimation(labelH2, "geometry");
animation2->setDuration(153);
animation2->setStartValue(QRect(138, 102, 60, 14));
animation2->setEndValue(QRect(71, 102, 60, 14));
animation2->start(QAbstractAnimation::DeleteWhenStopped);

QObject::connect(boutonItem, SIGNAL(sliderReleased()), this, SLOT(HideItem()));

}

void WinA::HideItem()
{
//Seconde Animation
animation3 = new QPropertyAnimation(labelH, "geometry");
animation3->setDuration(153);
animation3->setStartValue(QRect(200, 102, 60, 14));
animation3->setEndValue(QRect(138, 102, 60, 14));
animation3->start(QAbstractAnimation::DeleteWhenStopped);

QObject::connect(animation3, SIGNAL(finished()), labelH, SLOT(clear()));

//Seconde Animation
animation4 = new QPropertyAnimation(labelH2, "geometry");
animation4->setDuration(153);
animation4->setStartValue(QRect(71, 102, 60, 14));
animation4->setEndValue(QRect(138, 102, 60, 14));
animation4->start(QAbstractAnimation::DeleteWhenStopped);

QObject::connect(animation4, SIGNAL(finished()), labelH2, SLOT(clear()));

boutonItem->setValue(40);

}
@

As you can notice the position of the slider is reset through HideItem().
I forgot to mention that I use stackedwidgets in my app and this problem happens when I come back to the widget. First of all, is it the right methode to reset the position? If not, how can I reset my slider properly? Thanks.