Can't remove attribute because it doesn't appear in the edit page

I was watching Despicable Me 3 today and I noticed that on the IMDb page (http://www.imdb.com/title/tt3469046) that Eric Guillon has attributes of both "co-director" and "co-directed by". The "co-directed by" is the correct one but I can't find where the "co-director" comes from. I tried editing both the movie page and the name page of Eric Guillon but the "co-director" attribute doesn't appear on either.