extjs - Why is data within a memory proxy marked as dirty? -

i've store using memory proxy. store it's data calling loadrawdata method. make changes data using roweditor & rowaction result in dirty records seems correct behavior store never able sync data why cells marked red triangle?

i think must oversee here. how can spare these trinangels without loosing track on modified fields?

i using extjs 4.2.1

if don't want little red triangles on grid, can set following in viewconfig.

markdirty: false 

http://docs.sencha.com/extjs/4.2.1/#!/api/ext.view.table-cfg-markdirty