Internet Batch - Transaction date shows paid thru instead of actual batch date

Hi,

The dues payment transactions in our internet batch always show a Trans.TRANSACTION_DATE = 6/30/2013 (the paid thru date) instead of the actual batch date (e.g. 7/9/2012) like the other transactions in the batch.
Has this ever happen to anyone else or do you have any idea what could be causing it?

Thanks in advance!
Silvie