There are a couple of possible reasons for this:
Changed card type
When you change your credit card type there may be a slight delay before you are able to view the new card in the mobile app or Online Banking, however the old card will be removed.
This is part of the set up process and you will be able to view your credit card details going forward.
Unused card
If you have a credit card you no longer use, this will be removed from the mobile app and Online Banking.
