wwwoffle -purge doesn't clean cache

Hello,

I notices that my cache takes more place than it's supposed to. I configured
it only to purge cache according to used/free FS space, without specifying
maximum age. But it seems that wwwoffle does not free up enough (configured
amount) of FS space. 
Did I do/get something wrong?


Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/hda3              2056320   1602020    351484  83% /var

Purge
{
        use-mtime       = no
        max-size        = 1024
        min-free        = 512
        use-url         = yes
        del-dontget     = yes
        del-dontcache   = yes
        age             = -1
        compress-age    = 1m
}

trying "wwwoffle -purge" results in:

Pass 1: Checking dates and sizes of files:
  (Using last access time.)
  (Using the full URL.)

[deleted]

Total of 2797 directories ; 377906 kB (0 kB deleted) (0 kB compressed)

Age Profile of cached pages:
  (All ages scaled to the range 0 -> -1 (default age).)

Total not purged   ; 377906 kB (351492 kB free)

WWWOFFLE Purge Finished.

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