Transaction Rule was created for Cash in transactions for Bank Interest. However, it doubles up Cash in transactions after running transactions rule.
If this transaction rule is for a Cash In transaction, then it must be entered in the field "Classify as" as an Income event, not an expense event.
Transaction Rule has been classified as 'Bank Interest Paid' instead of 'Interest Received'.
this makes the journal entry:
Dr Cash In
Dr Bank Interest paid
leaving the Credit side as unmatched.