In Naruto Manga 675 Obito has the Rinnegan in his left eye.
http://narutobase.net/manga/Naruto/675/11/
Madara comes and takes the Rinnegan. In Manga 676 Obito now has his sharingan in his left eye.
http://narutobase.net/manga/Naruto/676/4/
Why would Madara move Obito's sharingan from his...