I think I found a bug while using the export/import-functionality of WinSCP.
When you delete a Session in login/session-window (when you start WinSCP), it isn't displayed anymore. But when you export your settings to an ini-file, the deleted sessions and folders where still inside the ini-file. That's also the reason, why deleted sessions and folders appear again when restoring the ini-file.
Another strange thing is, when you start WinSCP it is possible to import settings from an ini-file. After you logged into a session and colsed it again (Session > Session disconnect), there were less options (such as import settings...) under the button 'tools' in the login/session-window. When restarting the application the dissapeared options appear again.
I hope I discribed the problems well enough.
[Sorry for my bad English]