Strophejs ejabberd getting archived messages, not getting first message

Question

I am using strophejs for querying archived messages from ejabberd. I am getting the messages but problem is that first message is not in the response.

The code is as follows

var iq = $iq({type: 'set', id: $scope.jid})
            .c('query', {xmlns:'urn:xmpp:mam:1'})
            .c('field',{'var':'with'})
            .c('value')
            .t(jid);

            conn.sendIQ(iq, archivemsg, errbak);

var archivemsg = function(iq) {
     console.log(iq);
}

What am I missing.?