Manager does not do any automation and this is human error. You should have clicked on History and it would usually delete the whole import in one go, saving you time. Also it is good practice to make a backup before importing a new statement, I would also advise you to regularly update Manager, For Desktoo versions use Download | Manager you will notice that we are currently on v23.9.21.1010 so many versions further (yours is 723 of 18 (18) March(3) 2023 (23). We are now 1010 of 21 September 2023.