Hey @Patrícia - welcome to the Community!
It sounds like you have a filter enabled on your board! You can see this at the top right of your board, there should be a button that says 'Filter'. Next to this text is an X - if you press this, it'll cancel the filter and you'll be able to see your cards again.
Era exatamente isso!
Obrigada Alex!
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No worries @Patrícia! Do you mind accepting my answer as the correct answer in case other people who stumble across this question need to know the solution to your issue?
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