Im not sure what type of surgery was performed, nor do I know what your nostrils looked like before. They do seem to be uneven, but soon after rhinoplasty, it is common to see uneven nostrils for a little while.Make sure that this is brought up to your surgeon when you next see him.All the best.
It would be interesting to see your pre op photos to see if there was something there that would have predisposed you to this outcome. If there was nothing on preop then the most common causes of this are placing the incision along the edge of the cartilage is different on one side, asymmetrical resection of the lower lateral cartilage, misplaced suturing of the cartilage, asymmetrical healing/scaring, incisional closure different on either side.