Looks like you accidentally used the "show all cards assigned to me" shortcut. If it is a private board & you didn't bother assigning cards to yourself, then all the cards would be invisible.
Try typing `q` & the card will show up again, I believe.
@Looi Tan more generally you might have also hit "f" and typed some text which would have applied a gibberish filter that would hide all cards, if you look in the top right you'll see a little green "0 search results" with a little white "x" you can click on to clear the filter.
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