Hello kretzschmar.nathalie,
Thanks for your interest in Nicepage!
Please give us more details, do you use the desktop app or an online editor?
Can you see the project in the backups folder? Do you click unpublish and delete? Or does it delete itself?
...................................................
Sincerely,
George.
Nicepage Support Team
Please subscribe to our YouTube channel: http://youtube.com/nicepage?sub_confirmation=1
Follow us on Facebook: http://facebook.com/nicepageapp
Desktop app?
Do you have the Documents\Nicepage folder with files inside?
Did you move or delete anything?