Thank you for your feedback, your queries are mostly around the stealth feature of the tool.
When you edit a stealth order no request is sent to the broker and no order is filled, it just updates the values in memory, you may experience a UI lag instead.
Depending on the direction the bid or ask price has to hit the stealth target price before the position will close, so it may seem like it has reached the target but in theory, it hasn't, also, due to limitations with the stealth order feature there will be a delay of 1-2 seconds before it closes.
In a volatile market, because the stealth prices are held in memory and not with the broker, there will be a delay, we will state this on the product page as a limitation.
We closed a position using the stealth "close position" button and it closed in less than a second, it should be as fast as the cTrader terminal, we tested this on various positions and there was no delay of more than a second.
We are fixing the bug issue with the Stealth order grid defaulting to line 1.
If you wish to discuss this further then please post on the community chat group below and not here where we can have better 2-way communication.