ISO_3166-1 defines Turks & Caicos Islands as a country 

see: https://en.wikipedia.org/wiki/ISO_3166-1 

further, it is part of the BOTs relation, so  this is only a contention with how Organic Maps defines a country (ie not an issue that can be fixed by a user)

see the BOTs relation: https://www.openstreetmap.org/relation/3969434