In the password file, I see several same username, such as:

<user>

    <name>test</name>

    <password encoding="SHA256">iXhH.</password>

    <full_name>test me</full_name>

    <last_logout>Tue Apr 14 14:12:44 2009</last_logout>

    <last_activity>Wed May 19 09:39:32 2010</last_activity>

    <email>maqm@ihep.ac.cn</email>

    <email_notify/>

  </user> 

<user>

    <name>test</name>

    <password encoding="SHA256">iXhH.</password>

    <full_name>test me</full_name>

   <last_logout>0</last_logout>

    <last_activity>0</last_activity>

      <inactive>0</inactive>

    <email>maqm@ihep.ac.cn</email>

    <email_notify/>

  </user> 

<user>

    <name>test</name>

    <password encoding="SHA256">iXhH.</password>

    <full_name>test me</full_name>

    <last_logout>0</last_logout>

    <last_activity>0</last_activity>

      <inactive>0</inactive>

    <email>maqm@ihep.ac.cn</email>

       <email_notify/>

  </user> 

I don't know the reason why eLog can have the same username.

And what should I do to prevent these things happen?

Thanks!