By default, all accounts at a given bank are linked to your bookkeeping account and for Credit Card accounts duplicates may appear if there are multiple cards issued. You can, however, choose to exclude, or 'hide', accounts that are not business-related or are duplicated Credit Card accounts.
To do so, follow these instructions:
1) Navigate to the "MANAGE" page.
2) To hide an account, uncheck the box under "Show in Reports?"