[Simple-support] Bug when read XML with ArrayList and HashMap created by simple

There is a small class which creates default configuration and saves it 
into file:

package videocontroldesk.params;

import java.io.File;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.simpleframework.xml.Element;
import org.simpleframework.xml.ElementList;
import org.simpleframework.xml.ElementMap;
import org.simpleframework.xml.Root;
import org.simpleframework.xml.Serializer;
import org.simpleframework.xml.core.Persister;

@Root
public class VCDParams {

    private static VCDParams instance;
    private static final String filename = "VCDParams.xml";
    private static final Logger logger = 
Logger.getLogger(VCDParams.class.getName());

    @Element
    private int selectedLayoutIdx;

    @ElementList
    private List<LayoutParams> layouts;

    @ElementMap
    private Map<String, String> ipForCamera;

    private VCDParams() {
        selectedLayoutIdx = 0;
        layouts = new ArrayList<LayoutParams>();
        for (int i = 0; i < 4; ++i) {
            layouts.add(new LayoutParams());
        }
        ipForCamera = new HashMap<String, String>();
        ipForCamera.put("БК1", "192.168.0.101");
    }

    public int getLayoutsCount() {
        return layouts.size();
    }

    public LayoutParams getLayout(int layoutIdx) {
        return layouts.get(layoutIdx);
    }

    public static VCDParams getInstance() {
        if (instance == null) {
            try {
                instance = read();
            }
            catch (Exception ex) {
                instance = new VCDParams();
            }
        }
        return instance;
    }

    private static VCDParams read() throws Exception {
        Serializer reader = new Persister();
        File f = new File(filename);
        return reader.read(VCDParams.class, f);
    }

    public void save() {
        Serializer saver = new Persister();
        File f = new File(filename);
        try {
            saver.write(this, f);
        } catch (Exception ex) {
            logger.log(Level.WARNING, "Не могу сохранить файл {0}", 
filename);
        }
    }

    public static void main(String[] args) {
        //VCDParams.getInstance().save();
        VCDParams params = VCDParams.getInstance();
        //String[] cams = 
VCDParams.getInstance().getLayout(0).getAllCamIds();
    }

}


If I uncomment "save()" method call I get the following XML:

<VCDParams>
   <selectedLayoutIdx>0</selectedLayoutIdx>
   <layouts class="java.util.ArrayList">
      <layoutParams columnsCount="2" rowsCount="1">
         <cell cellId="0">БК1</cell>
      </layoutParams>
      <layoutParams columnsCount="2" rowsCount="1">
         <cell cellId="0">БК1</cell>
      </layoutParams>
      <layoutParams columnsCount="2" rowsCount="1">
         <cell cellId="0">БК1</cell>
      </layoutParams>
      <layoutParams columnsCount="2" rowsCount="1">
         <cell cellId="0">БК1</cell>
      </layoutParams>
   </layouts>
   <ipForCamera class="java.util.HashMap">
      <entry>
         <string>БК1</string>
         <string>192.168.0.101</string>
      </entry>
   </ipForCamera>
</VCDParams>


It looks OK. Then I comment "save()" and uncomment " 
VCDParams.getInstance()" call.
When I set breakpoint right after this call I check the value of 
layouts.size(). It return 8 instead of 4.
Please fix it.
Tested on 2.5.3 and 2.4.1.