Dropdownlist double list in gridview

Hi All
dropdownlist have to 2 item.but when i running to project i see 4 item.why 
in the list : 
GOOD
BAD
 
IN PROJECT 
GOOD
BAD
GOOD
BAD
 
 

<asp:TemplateField HeaderText="Durum"> <ItemTemplate> <asp:Label id="lblDurum" runat="server" Text='<%# Bind ("Durum") %>'> </asp:Label> </ItemTemplate> ...