He isn't mixed - he just isn't as vibrantly coloured as yours.
See these for example:
http://www.shagbarkbantams.com/minon.jpg
http://1.bp.blogspot.com/-IJ7Ia9GankE/UIixo3kkq_I/AAAAAAAAJKM/zKuGgCdbpIU/s400/DSC02878.JPG
http://cdn.backyardchickens.com/2/22/22a9ee7b_54479_rooroo6.jpeg
http://cdn.shopify.com/s/files/1/0063/8272/products/mille_fleur_duccle_medium.jpg?169
x2