The matching supports multiple matching scenarios. Also when a match is not found there is a possibility that the confidence will help you to apply the payment with the related outstanding entry. Therefore you can use the information which can be found in the factbox and log of resp. the Reconciliation journal and bank/giro journal. Also check the apply manually page where you can find additional info on matching.
Drill down on the match condifdence field in the W1 Matching to see the detail why the applied is proposed.
Open the function apply entries in the bank/giro to see the matching detail or proposal.