97x Dupe problem.

Hello.
I've been looking in lot of forums but nothing, I hope someone in here can help.
I have 97p Mu server. Itš like 97d but with kalima and new items.
I ussed lot of anit-dupe scripts but they ban accounts and it's really big mess with those scripts.
Is there someway to get off that bug! Maybe somewhere in client or serverfiles?
I'ts a really big problem,Please help me someone!

Up,please help someone

Usually dupes are caused of lag.

YeS,it's a lag,because when you are at bank you can open blood Castle and Devil Square windows,and than dupe items,there is some server,where you can't jus open them,maybe someone in here know how to do it!
Lot of people are saiying'This lag is on server side'