Even for the same variety, if a large stop loss is set in some time periods, it may not reach the stop loss level before the contract delivery. If you open a position in both directions, you may not be able to reach both stop-loss positions and go back and forth between them.
However, sometimes the fluctuations are particularly large. When the trend comes, it rushes quickly, hitting new highs or new lows again and again. If the list is reversed, it will die. A loss may spit out all the previous profits, or even lose more.