Listview separatorStyle bug ? sdk 3.2.1 GA and 3.2.2 GA

I have little problem with separatorStyle of listview. If I set

separatorStyle: Ti.UI.iPhone.ListViewSeparatorStyle.NONE

when I open a listview, I close it and re-open it, in listview appears one or two blank rows. If I don't set separatorStyle I see the listview regular.

var self = Ti.UI.createListView({
    top: 1, bottom: 1,
    width: 320,
    backgroundColor: 'transparent',
    templates: {
        'primo': myTemplate, 
        'secondo': myTemplate2
    },
    allowsSelection : true,
    style: Ti.UI.iPhone.ListViewStyle.PLAIN,
    separatorStyle: Ti.UI.iPhone.ListViewSeparatorStyle.NONE
});

With new 3.2.2 sdk the problem is little different, blank rows disappear after one/two scroll upside down .

If I don't set separatorStyle I see the listview without problems. blank rows don't appears.

Any idea?