this is a possible reason15 May 2018 15:01
for the messing about.we have been in very closed ranges over many weeks and months.
One-Cancels-the-Other Canceled Order
A one-cancels-the-other (OCO) order consists of two dependent orders; if one order executes the other order is immediately canceled. Traders who play breakouts could use this order type. For example, if a stock was trading in a range between $40 and $60, a trader could place an OCO with a buy limit just above the trading range and a sell limit slightly below the trading range. If the stock breaks out to the upside, the buy order executes, and the sell order gets canceled. Conversely, if the price moves below the trading range, a sell order executes, and the buy order is purged. This order type helps reduce risk by ensuring unwanted orders get automatically canceled.
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