"Mislabeled" and "mislabelled" are both correct spellings, but "mislabeled" is preferred in American English, whereas "mislabelled" is the preferred spelling in British English. "Mislabeled" is the American English spelling for describing something that has been labeled incorrectly. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.