Qtreewidget not displaying first item in a Qlist

I'm trying to display items in a QList on a QTreeWidget but no matter how hard i tried i observe that always the first item in the List is not inserted on the treeWidget. Please i need help. Below is my sample code

Code:

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void Results::showResults (QList<Semester*>* sList){
     for(int i=0; i<semList->count(); i++)
     {
           ui->treeWidget->addTopLevelItem(sList->at(i)->treeItem);
     }  
     this->show ();
 }

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NB: every Semester item in the list has a treeItem member.