Node iterator missing first value when importing xml [closed]

edit

I'm currently saving a large map of histogram data to xml for use in a later part of my program. I've noticed that it is cutting off the first value when loading and instead adding an empty value at the end.

A basic example is:

Correct Model:
<model1>0,1,1,1,1,1,1,0</model1>

Incorrect Loaded Model:
<model1>1,1,1,1,1,1,0,1.4013e-45</model1>

The layout of my xml file below where i is a changing value:

<Serial></Serial>
<classes>
  <class_i>
  <Name></Name>
    <m_i type_id="opencv-matrix">
    </m_i>
  </class_i>
</classes>

My import function is below:

int getClassHist(map<string, vector<Mat> >& savedClassHist){
  int serial;
  // Load in Class Histograms(Models)
  FileStorage fs3("models.xml", FileStorage::READ);
  fs3["Serial"] >> serial;
  cout << "This is the serial: " << serial << endl;
  FileNode fn = fs3["classes"];
  if(fn.type() == FileNode::MAP){

    // Create iterator to go through all the classes
    for(FileNodeIterator it = fn.begin();it != fn.end();it++){
      string clsNme = (string)(*it)["Name"];
      savedClassHist[clsNme];

      // Create node of current Class
      FileNode clss = (*it)["Models"];
      // Iterate through each model inside class, saving to map
      for(FileNodeIterator it1  = clss.begin();it1 != clss.end();it1++){
        FileNode k = *it1;
        Mat tmp;
        k >> tmp;
        savedClassHist[clsNme].push_back(tmp);
      }
    }
    fs3.release();
  }else{
    ERR("Class file was not map.");
    exit(-1);
  }
  return serial;
}

It seems like an iterator problem so would be likely be in the it1 loop which is skipping the first value but i'm not sure why.??