I asked someone Est-ce que j'ai tort?, and the response was, "Oui, tu as tord."
I thought maybe it was a spelling mistake, but he said that there are two ways of writing it. I can't seem to find anything in English explaining the difference between the two. Is there a difference, or are the two interchangeable?
I found this: http://www.ladictee.fr/grammaire/truc_astuce_grammaire/tort_ou_tord.html but I don't know enough French to know what it means, and Google's auto-translate isn't very helpful.