Hi Nacho,
Thanks for raising this question! Sorry to hear you've experienced this issue. And I hope it's okay if I respond in English 🙂
Has this content been recently created? Have you used different devices when creating the content and then looking for it afterward? Were there any internet connection issues when you were working on your boards? Trello doesn't support offline access, so if your connection was disrupted, some updates might not have been sent to our servers.
Also, if you worked on your boards from a mobile app, it sometimes happens that content isn't synced automatically. If it's indeed the case, you can check out our article to help you troubleshoot issues on iOS: https://support.atlassian.com/trello/docs/troubleshooting-for-the-ios-app/
On a side note, have you tried checking the Activity section in the board's menu? If the cards were moved or removed by any other board member, you should be able to find a trace of it there: https://support.atlassian.com/trello/docs/the-board-menu/#:~:text=context%20you%20provide!-,Activity,-The%20activities%20of
If that doesn't help, could I ask you to create a ticket through https://trello.com/contact? This gives us access to a few more tools to help investigate, and we can discuss information that can't be shared in the community.
Alina | The Trello Team
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