My name appears on my wife's Photo Streams instead of hers.

My name appears on my wife Photo Streams instead of hers; is there a fix for this? I have checked all her settings, but found nothing. The only thing we have in common is that we share the same Itunes account on the two devices, but that should not matter, should it?? When she comments on her friends pictures, it looks like I am the person leaving the comment.