Thanks for posting and welcome to the community.
Could you please try clearing the browser cache or disabling any extensions( like - Card Colours for Trello etc.) and see if that works for you?
More over as trello shortcuts - semicolon key can show and hide labels. So, you can press it and refresh the tab to see if fixes your issue.
Please accept the answer if it solves your query else respond and allow others to share input.
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