Just got our Canada Immigration Visa in our Passport with the confirmation paper by mail, Question, how come the expiration date for visa is different from i and my spouse since it was filed and received back?
the expiration's are directly related to the expiration of your medical exams. If you didn't do your exams on the same days, that is why your expiration's are different. Just be sure you 'land' before either expires or it's game over.
You would need to ask immigration then why specifically it is different. Again, it really does not matter as they are ONLY an expiration date for when you absolutely MUST LAND by. So long as you land before your expiration date, you will be fine.