How to Avoid Doubling Up by Accident

One order, sent twice

Doubling up by accident is holding twice the size you meant because an order went in twice. Take a buy of 0.40 lot — a lot is 100,000 euros — on the euro against the dollar at 1.17398, the close on 17 December 2025, that goes in twice. The second fill is a whole second trade at the same price in the same direction. A pip is now worth 8 dollars instead of 4; the 25-pip stop, if it is on both, is 200 dollars instead of 100, two per cent of a 10,000-dollar account instead of one; and the margin held at 1:30 is 3,131 dollars instead of 1,565. On a hedging account the Trade tab shows two rows, and the second has no stop until one is put there.

A stamp pressed twice

Picture a form stamped twice. An office that acts on stamps does not ask whether the second one was meant; it sees two and acts on both. The platform is that office. Every press of the buy button is a stamp, and every stamp is sent to the market and filled. A second press on a slow connection, a double click where one was meant, a tap on the phone after the click on the laptop — each is a second order, and the market fills it at the going price. Nothing on the form says which stamp came first, and nothing in the market cares. The second stamp is not a copy. It is a second trade.

This paper is locked