Order executed despite failure status

ramatius
Hi, Today morning there was an order for NIFTY17NOV10500CE quantity 600. The API call returned failure status. So the system called the API again, which succeeded. However, later on it is found that there are two orders created - 171101000167019, 171101000167146.

So the first order also went through to the exchange, despite the API returning an error status. This is the first time ever I have seen this behavior. So far, when the API returned an error, no orders were sent to the exchange. Can you pls see this and comment what could possibly be causing this?
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