Unreconcile Accounting were created in the wrong period.

Hi everyone,
I have a problem about unreconcile account. I think it might go in the wrong period when create accounting at AP Payment.
The payment was created accounting in SEP-12
Dr   Liability   xxx   (SEP-12)
   Cr   Cash Clearing   xxx   (SEP-12)
after did reconciled the accounting were
Dr   Cash Clearing   xxx   (SEP-12)
   Cr   Cash   (SEP-12)
Then I did unreconcile payment but I saw the period of unreconcile are in OCT-12
Dr   Cash   xxx   (OCT-12)
   Cr   Cash Clearing   xxx   (OCT-12)

I did unreconcile at 3-OCT-12. I don't know if the transaction date is the reason that the unreconcile date went in the different period of the reconcile period.