old trades still active after expire

trades are still active from old posts even some cases after i make new posted trades players are still sending requested trades of an old posted trade even after i made new posted trade or even no new posted trade

It's because people haven't refreshed the trade list and your old trade still appears to be active. They also can't see your new trades either.

sometimes it keeps active even after hours refreshing and updating.

If you press update, it will add ALL trades made since the previous update, including those expired, except when people have posted another trade.
Double clicking on the update will remove those expired.