Am so glad to know that i am not the only who find this bizzare. @ Poornima.
this average system is confusing and saying every other platform does same make no sense. Since we can not verify if every broker from india and outside india follow same but we can come to one conclusion that this is very unnecessary feature. once closed off all the position, next trade should not averge and give misleading buying and selling price and misleading P&L.