Stop orders are used as a limit on losses, and they behave predictably in ordinary conditions. In the conditions people buy them for, they frequently deliver an outcome well beyond the level chosen.
A stop is a trigger, not a price guarantee
A stop order sits inactive until the market reaches the specified level, at which point it is submitted as a market order.
A market order takes whatever is available, so the execution price depends on the state of the book at that instant.
The stop level determines when the order is sent. It has no bearing on what price comes back.
Gaps and thin books widen the outcome
If the price moves through several levels in one burst, the order is submitted after the move and fills at the far side of it.
Depth is thinnest during those bursts, because market makers withdraw quotes when uncertainty rises, so the order consumes a book that has just emptied.
The result is a fill materially below the stop level, produced by the same volatility the stop was intended to protect against.
Clustered stops feed the move
Traders place stops at conspicuous levels such as round numbers and recent lows, which concentrates many orders in a narrow band.
Reaching that band submits all of them as market orders at once, and the combined selling pushes the price further into the remaining stops.
Prices often reverse shortly afterwards, having moved on forced flow rather than on any change in what participants believed.
Stop limits substitute one failure for another
A stop limit order triggers at one price and submits a limit order at another, which caps the worst acceptable fill.
If the market moves straight past that limit, the order simply rests unfilled, and the position remains open while the price continues to fall.
The choice is therefore between an uncertain exit price and an uncertain exit, and neither option removes the underlying problem.
Position size is the more reliable control
The dependable variable is how much is at risk before any order is placed, since that figure does not depend on execution conditions.
Lower leverage widens the distance to any forced exit and reduces the consequence of a poor fill when one occurs.
Stops remain useful for enforcing a decision without being present, provided the level is treated as an instruction to exit rather than as a guaranteed floor.