First time failure?

Defraggler v1.21.209

I used this today for the first time and had very strange results.

Windows Vista Home Premium Version 6.0 (Build 6001: Service Pack 1)

Dell Inspiron 1525

OS (C:) NTFS 99.1 GB Free 58.6 GB

RECOVERY (D:) NTFS 9.99 GB Free 5.7 GB

OS (C:) [First] Analysis = 8% Fragmentation.

I ran the Defraggler Defrag (approx 90 minutes).

I then checked again, and found this:

OS (C:) [second] Analysis = 20% Fragmentation.

What is wrong here? It appears that running Defraggler has INCREASED the fragmentation of my hard drive?

likly your system restore created files when idle