Domino Backups with Arkeia

I’m having a problem using Arkeia to backup a Domino 6.5.1 server. Arkeia uses archive style transactional logging in order to do online incremental backups. Arkeia documentation says that after the log files are backed up that they are given a archive bit so that the next time Domino is started the archived log files are deleted. For some reason, my server is not deleting these log files, Arkeia support blames Domino, and IBM support blames Arkeia. I’d appreciate any help.