No subject

I am expecting output like 
<parent> 
First String Content
	<firstSub>1 content</firstSub> 
	<secondSub>2 content</secondSub> 	
	<thirdSub>3 content</thirdSub> 	
</parent>

but instead it is coming out like this
<parent> 
First String Content
	<secondSub>2 content</secondSub> 	
	<thirdSub>3 content</thirdSub> 	
	<firstSub>1 content</firstSub> 
</parent>

Here is sample code


import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.util.*;

import org.jdom.Document;
import org.jdom.Element;
import org.jdom.JDOMException;
import org.jdom.input.SAXBuilder;
import org.jdom.output.XMLOutputter;

public class MarkTest {

    public static void main(String[] args) {
        Element parent = new Element("parent");
        parent.addContent("First String Content\n");
        Element firstSub = new Element("firstSub").addContent("1 content");
        parent.addContent(firstSub);
        Element secondSub = new Element("secondSub").addContent("2
content");
        Element thirdSub = new Element("thirdSub").addContent("3 content");;
        LinkedList sublist = new LinkedList();
        sublist.add(secondSub);
        sublist.add(thirdSub);
        List curContent =parent.getMixedContent();
        curContent.addAll(sublist);
        XMLOutputter xout = new XMLOutputter("\t", true);
        try {
              System.out.println("What does it look like?
\n"+xout.outputString(parent));
        } catch (Exception e){
              e.printStackTrace();
        }
    }
}