Finally got around to calling. Asked how come my wife's card has a different "member since" than mine. She answered that hers is probably going according to when she got the card as opposed to when account was opened. She then went ahead and offered to send out a new card with the year updated to same one as mine without me even asking
Now just going to wait until that card comes and call in to get her other cards matched to that one. Thanks
Update: the new card never showed up and when I called to inquire what the issue was I was told it must have been a mistake because they can't do that. Thing is that on creditkarma I notice that the account started being reported as being opened from when I originally opened the account and not from when she was added as an AU