jQuery Grid Plugin - jqGrid

Hi, I am using the True Scrolling Rows feature of the 3.6 release. The problem I am encountering is:

• i have a rowNum: 100
• let's say the total number of items is 230
• the grid displays the first 100, when i scroll down it dynamically loads the ones from 101 -200 but if I scroll further it never loads the 201-230.
• Seems that it only loads full pages of a 100 could that be?

My grid definition is:myGrid = $("#lstListItems").jqGrid({
scroll: 1,
url:'{% url ajax-lists-grid-items %}?list_id={{ list.id }}',
datatype: 'json',
height: 440,
width: 500,
colNames:['{% trans "Key" %}', '{% trans "Name" %}],
colModel :[
  {name:'key', index: 'key', width:50, search:true},
  {name:'name', index: 'name', width:100, search:true},
],
rowNum: 100,
mtype: "GET",
rownumbers: true,
rownumWidth: 40,
gridview: true,
viewrecords: true,
pager: '#pagerListItems',
});

Am i missing something?

thanks
Rok