When the stock opened it hit the lower price band (5% down) at Rs 10.30. Once it hit the lower price band there were no bids at that particular price which is why your order was pending. This would have affected everyone who had placed a sell order irrespective of which brokerage they use.
Even if orders were executed after it hit lower circuit, your pending order will be executed based on a price time priority on the exchange OMS.
Well got an answer, understand that if we place an order & have a certain % as disclosed quantity, then the system will sell the disclosed qty & then subsequently put your order for the next % of disclosed qty as a new order.So, if you place 1000 shares to sell with a disclosed qty of 100, then there will be 10 orders each one getting triggered after the first 100 is sold. I was under the impression that 10 simultaneous orders are created. Guess my impression was incorrect
If other brokers place consecutive orders for the disclosed qty then Zerodha should also modify their systems accordingly. I think @NithinKamath should focus on ensuring perfection that Zerodha works as designed, as off & on there are technical issues which crop up.