@Leandro de Oliveira welcome to the Atlassian Community.
It's likely that one board has a filter applied that is displaying the count of cards and the other board does not. You can test this by going to the board that does not display the count and typing F then *. This will create a filer that displays the count of cards in each list. To remove this count you can hit F and then delete the * from the filter.
Hope this helps!
@Leandro de Oliveira if my answer helped you, please mark it as accepted so that others looking for the same content can more readily find it. Thank you!
Yes, this work fine, thank you
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