Not logging to the correct file

I have been running with:

file("/var/log/syslog-ng/$YEAR-$MONTH-$DAY/$HOST.log" dir_owner("root") 
dir_group("adm") dir_perm(0 750) owner("root") group("adm") perm(0640) 
create_dirs(yes));

(or $PROGRAM instead of $HOST), but still get some log events in:
/var/log/syslog-ng/$YEAR-$MONTH-$DAY/$FACILITY.log?!

daemon.log:
Mar 28 11:48:42 log_source@pawan dhcpd: Wrote 8 leases to leases file

mail.log:
Mar 28 00:04:14 log_source@pawan amavis[6299]: (06299-03) Passed, 
<bounce-debian-devel=allanwind=lifeintegrity.  com@xxxxxxxxxxxxxxxx> -> 
<allanwind@xxxxxxxxxxxxxxxxx>, Message-ID: <87r7vdsgum.fsf@xxxxxxxxxxxxxxxxxx>, 
Hits: -4.9

syslog.log:
Mar 28 00:01:05 internal_source@pawan syslog-ng[341]: STATS: dropped 0

My syslog-ng.conf is pretty complicated as I use it to filter my logs
real-time, but it looks something like this:

# sources
#
source internal_source {
        internal();
};

source log_source {
        unix-stream("/dev/log");
};

source kmsg_source {
        file("/proc/kmsg" log_prefix("kernel: "));
};


destination syslog_destination {
        file("/var/log/syslog-ng/$YEAR-$MONTH-$DAY/$HOST.log" dir_owner("root") 
dir_group("adm") dir_perm(0750)
 owner("root") group("adm") perm(0640) create_dirs(yes));
};


# log paths
#
log {
        source(internal_source);
        source(log_source);
        source(kmsg_source);
        destination(syslog_destination);
};


/Allan
-- 
Allan Wind
P.O. Box 2022
Woburn, MA 01888-0022
USA
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