Hi, I'm sorry that happened to you! I don't know what exactly happened there. Restricting cookies / website data in your browser can prevent the game from saving correctly, maybe that's the issue. Did you play the game in browser or use the desktop (downloadable) version?
That seems a little strange. Maybe the autosave got disabled somehow? The game usually saves every 30 seconds and notifies you about it. Could you please open your in-game settings (top right) and check if there is a number in the autosave option (generic, third option)?