This typically happens in illiquid contracts and if there is a big market order placed. This tends to move the market in one direction quite a bit, especially on contracts like Lupin.
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Adding to Nithin’s answer…it can also happen because of company/sector specific news. For example, Infosys always announces its results at 8:30AM (before market open), based on the results the stock, and its futures can have a drastic move at opening.
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@Nithin, are trades actually executed at those prices? is it safe to punch AMO in such contracts for stop loss order(SL-M)?