I’ve bought the share 3x Apple at the price of 40,17 . When the (sell) price went up, I've wanted to secure my profit, so I've put a Sell with STOP on 40,25 . After few minute the Sell Price went below the 40,25 $ and didn’t trigger the my Stop Sell. Am I missing something?
LIMIT - here you set the price you want to sell for.
STOP LIMIT - this is a sort of 2-step order. First the price needs to reach the STOP price, when that is reached the order will be sent to the market as a LIMIT order. The STOP price is nothing more than an activation.
There is also the regular stop which is, imo, what OP wanted to do.
Stop/stop loss… like you said is basically an activation of an order that will be sent as a market order, so the price is not guarantee, the activation is (or at least it should be.)
I had a similar experience to OP, but I had my STOP LOSS order set to keep me from losing too much money since a few days ago (the sell price I set was idiotic, but that’s beside the point.) I had GraniteShares 3x Short Rolls-Royce with a stop loss at p117, but when I checked, the price was already below p116 and it seemed like the stop loss wouldn’t activate, so I ended up manually putting a market order. Maybe it would have executed after a few minutes, maybe not, but this isn’t the first time one of my stop loss order isn’t executed. IMO this shouldn’t happen.