CAknSliderSettingItem works abnormally on N70 and N72: current value can't display on setting page

CAknSliderSettingItem is used in my application, and the application is built under SDK 2nd fp3. On 6630, it works fine; but on N70 and N72, the slider works abnormally: current value, and the label for minimum/maximum can't display on setting page (the page to change the value of slider setting item).

Following is defined resourece in rss:

RESOURCE AVKON_SETTING_ITEM_LIST r_setting_item_list
{
flags = 0;
title = "Test";
initial_number = 1;
items =
{
AVKON_SETTING_ITEM
{
identifier = ESettingItemSlider; // it is 1
setting_page_resource = r_setting_item_slider;
name = "Slider Test";
}
};
}

RESOURCE AVKON_SETTING_PAGE r_setting_item_slider
{
number = 0;
label = "Slider Test";
type = EAknCtSlider;
editor_resource_id = r_setting_item_resource;
}

RESOURCE SLIDER r_setting_item_resource
{
layout = EAknSettingsItemSliderLayout;
minvalue = 0;
maxvalue = 100;
step = 10;
valuetype = EAknSliderValueDecimal;
minlabel = "Min";
maxlabel = "Max";
}

Any suggestion is welcome, thanks!