rsync and Mountain Lion Server

I came upon some strange behavior while trying to perform an rsync operation from remote machines to a freshly installed Mountain Lion Server. I'm using Mountain Lion as opposed to Mavericks because of the multitude of problems I've had with the latest OS. This might be the last nail in the coffin for OS X as a server platform.

Essentially, when performing an rsync operation to the server, the server eventually "runs out of hard disk space." I put quotes around this because without warning the disk space will drop to virtually nothing, with hundreds of gigs of free space disappearing. Once the rsync operations have stopped, eventually the server will return the free space. I can't find anything in the logs, or I'm not looking in the correct ones.

Any help you may be able to provide would be amazing. Thanks in advance!

I have included a video: https://owncloud.wiredtortoise.com/public.php?service=files&t=9835a02672f1afa359 f87b1ba74d92fb

Skip to a bit before 2:00 for the fun.