Check this thread, it may help you, it has already happened to other colleagues and they have given a solution
https://community.atlassian.com/t5/Trello-questions/Labels-not-showing-in-Trello/qaq-p/1106469
https://community.atlassian.com/t5/Trello-questions/My-labels-have-disappeared/qaq-p/1127753
Regards
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