hi, I have amule 2.0.0 rc3 installed on my box; sometimes, it crashes, but this is not the matter

The problem is about the free disk space: right before the crash, I have, for example, 3 gb of free space. Right after the crash, it becomes about 5 gb!
It looks like amule, when crashing, "forget" to save some of the downloads (some gb!). Is there a reason for that?