Hello Edu,
good question here! When we have adding to the position we consider it as one loss, because we close one position. Even we added few times, at the end it is one position that closed.
Some platforms add to the position, and when you open 0.1 lot for example, and you add another 0.1, you will see 0.2 opened trade. But Meta Trader shows it as different position. However for the strategy/expert advisor it is one.
And if we say 10 trades, it means 10 different positions.
Kind regards,