Hi Flavia,
Welcome to the Atlassian Community!
It seems you've enabled particular settings, Trello has a colour-blind-friendly mode than can be enabled on cards. When enabled, labels will still include their original chosen colour, but a unique design will also be displayed, helping to further differentiate between labels and looks like you've enabled it!
To disable this, simply go to the menu on your board, select Labels, and select ‘Disable colour blind friendly mode’. Screenshot for your reference: https://share.getcloudapp.com/geuRyrLA
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