Users are unable to edit the General Ledger distribution on refunds. When unmapped transactions are refunded they will get the unmapped account on the refund. Even after mapping the GL in configuration and correcting the mapping on each of the original transactions, there is no way to fix the mapping on the refunds, they still appear in the unmapped transaction account.
This issue has been resolved in version 4.5 of Altru. All sites have been updated in October 2015.