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grid doesn't load all the rows in the grid

I've got a grid that loads rows in chunks dynamically. the first set of rows works great, but as you scroll down the subsequent row sets only show some rows and not all. sometimes its like no rows load at all. any ideas?

gridAll = new dhtmlXGridObject("gridAll");
gridAll.setImagePath("dhtmlx/imgs/");
gridAll.setEditable(true);
gridAll.setSkin("mt");

gridAll.enableEditEvents(true, false, false);
gridAll.init();
gridAll.enableSmartRendering(true,500);

...

gridAll.loadXML(URL,function(){
     ...
});