I have one board where instead of listing the cards with their various titles, it just says "2 cards" or "1 card" under the title of each list. I cannot click on individual cards. None of of my other boards have this problem.
@Grace Kennedy looks like you've inadvertently enabled a filter, look for a green widget in the top right with a white "x" on it, click the x, clear the filter, problem solved :)
FYI the way this is typically done is using the "f" keyboard shortcut. You can also use the "x" key on your keyboard to clear the filter:
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