Hello Trader,
Stop loss sell orders are intended to placed when you have open long position and want to reduce your loss if the price falls down.
It was initially designed on the concept you buy first and sell later.
A stop loss order sell works on the logic higher selling price the better.
In your case you were better of selling at 3782 than the lower 3780
If no one is available to buy your share at 3782 at the point, the computer would set 3780 as your limit price.
When there is a sudden drop in price, say 3775, it will wait for someone to buy at 3780 to close off your position.
Hope this simplifies the concept.