Performing Supplier Merge activity Bank account getting populated Invoices even paying by Check

Summary:

 Currently we want to Merge two Suppliers:

Supplier 1(ABC) who have Open Invoices and Payment Method is Check with Bank account information defined in Supplier Profile.

Supplier 2(XYZ) who also have Open Invoices and Payment Method is Electronic and no Bank information is defined.

So now when Supplier 1 is merged with Supplier 2. And if we are trying to process the Open Invoices of Supplier 2 then in the invoice Supplier 2 is showing Payment method as Electronic but with the bank details of Supplier 1.

Now the query is -- Is this is standard functionality? If so how it would have behave if the payment method would have been check for both the scenario-one supplier with bank details and another one without the bank details information.