mcp ordered links error...

I clicking Moderator Control Panel link and loging any forum...

after this action

selecting order function...

Display topics from previous: all topic
Sort by: replies
asc or dsc: desc

after, submiting form...

next link: mcp.php?&f=3&i=main&action=&mode=forum_view&start=20

page 2 link: mcp.php?&f=3&i=main&action=&mode=forum_view&start=20

but clicking next link or 2 page link, not ordering forum, my selected options...