Had a small short at Ameritrade. I covered using the buy key, not the cover key. And they put both positions in the account. Now thats no big deal , but why do they allow this? at IB , any short is automatically covered with a buy. What benefit is it to have two offsetting trades in the account? If you're doing it to bypass the uptick rule, you are in violation. So why does AMTD permit it? Only obvious reason is it forces you to make two unnecessary trades to unwind.