okay see the thick highlight ring at the horn base ? well think of it this way .... is that the end of something there is nothing else on it ? well that is an edge ... well if you look you have the rest of horn on top of it ..so that is not an edge ...here is an example real quick .

okay the picture ..both have highlighted areas ..those are edges ..end ones ...so that means there is nothing on top of them and finished ...if you add something on top you are not suppose to have an edge ..you join two things and they make a line and join ...so you have a horn and it is not joined to body correctly