Since Mitbringen.net does not uniquely identify a user by a name/password, it can only recognize a user if he or she reuses the same device and browser, and only within a "session". If in the meantime you have restarted your computer, closed your browser or entered the thing on another device (e.g. your smartphone), Mitbringen.net will no longer recognize you. Accordingly, it no longer knows that you have created these things. This can also happen if you have been registered more than 24 hours ago. By the way, you don't have these problems when you use the app.