Quick launch shows sites and page regardless of navigation settings

To resolve this issue, please make sure data source for quick launch navigation is surround by these tags:

<SharePoint:DelegateControl....>
  <Template_Controls>
     //Quick launch site map data source
  </Template_Controls>
</SharePoint:DelegateContol>

See the sample code below:

<SharePoint:DelegateControl runat="server" ControlId="QuickLaunchDataSource">
    <Template_Controls>       <asp:SiteMapDataSource
       SiteMapProvider="SPNavigationProvider"
       ShowStartingNode="False"
       id="QuickLaunchSiteMap"
       StartingNodeUrl="sid:1025"
       runat="server"/>
    </Template_Controls>
 </SharePoint:DelegateControl>