SiteMapPath moving backward

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C#

ASP.NET4

Hi
I have a siteMapPath in my page and every time page refreshes it moves backwards...need it to stand still. What might be the issue and how should i solve it?

Saple site map

<?xml version="1.0" encoding="utf-8" ?>
<siteMap xmlns="http://schemas.microsoft.com/AspNet/SiteMap-File-1.0" >

  <siteMapNode url="Home.aspx" title="Home"  description="Home Page">

    <siteMapNode url="Software.aspx" title="Software"  description="Software" >
      <siteMapNode url="Contacts.aspx" title="Contacts"  description="Contacts" />
    </siteMapNode>

  </siteMapNode>


  </siteMap>

<asp:SiteMapPath ID="sitemap1"  runat="server"></asp:SiteMapPath>