SL GTT was triggered and the Limit order was placed for 441.55 only (you may refer to the order book) when the order went for execution best bid price seemed to be a better price than the limit price, because of that the order was executed at 446.10. This option contract is down by 80% today, a 1% stop loss/target on this type of volatile contract will hit immediately and the price execution may differ from the limit price. Since the sell limit price is 441.55/-, the order will not execute below 441.55/-, if the best bid is available compared to the limit price, the sell order will be executed for the best bid price. This can happen with BO as well.
OCO GTT will place a limit order where the stop-loss is market on bracket order. You may check this thread to know the behavior of BO in a volatile market.