Hi there,
It sounds like the board filter is currently active, which hides cards that don't match the filter. Try pressing 'x' on the keyboard to clear the filter on that board, or click the 'x' next to the filter results panel:
Here's some additional info on searching for cards from our help pages: https://support.atlassian.com/trello/docs/filtering-for-cards-on-a-board/
All the best,
Lara
The Trello Team
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