so i did a little more research ( just use the search box for greasy hair and you get a bunch of hits) and the mostly people had greasy hair from too much oils/shea butter and the like. or it could be OC. It seemed to have built up on their hair. Do you shampoo at all? maybe you need a shampoo. oh just got an idea. if you feel your hair with no condish, stylers, ect, does it feel greasy then?
hope this helps!