fsck problem

When I boot into single user mode and perform an fsck -f no problems are found at all... However when I am booted in normal mode and do an fsck it reports the following:

** /dev/da0s1f (NO WRITE)
** Last Mounted on /var
** Phase 1 - Check Blocks and Sizes
** Phase 2 - Check Pathnames
** Phase 3 - Check Connectivity
** Phase 4 - Check Reference Counts
UNREF FILE  I=2802898  OWNER=qmailq MODE=100644
SIZE=1962 MTIME=May 19 09:53 2006
RECONNECT? no


CLEAR? no

UNREF FILE  I=2802900  OWNER=qmailq MODE=100644
SIZE=48 MTIME=May 19 09:53 2006
RECONNECT? no


CLEAR? no

UNREF FILE  I=2802901  OWNER=qmails MODE=100600
SIZE=18 MTIME=May 19 09:53 2006
RECONNECT? no


CLEAR? no

UNREF FILE  I=2802903  OWNER=qmails MODE=100600
SIZE=21 MTIME=May 19 09:53 2006
RECONNECT? no


CLEAR? no

UNREF FILE  I=2828978  OWNER=vmail MODE=100600
SIZE=2028 MTIME=May 19 09:53 2006
RECONNECT? no


CLEAR? no

UNREF FILE I=8481260  OWNER=mysql MODE=100600
SIZE=2412 MTIME=May 19 09:53 2006
CLEAR? no

UNREF FILE I=8481261  OWNER=mysql MODE=100600
SIZE=0 MTIME=May 19 09:51 2006
CLEAR? no

UNREF FILE I=8481265  OWNER=mysql MODE=100600
SIZE=0 MTIME=May 19 09:51 2006
CLEAR? no

** Phase 5 - Check Cyl groups
FREE BLK COUNT(S) WRONG IN SUPERBLK
SALVAGE? no

SUMMARY INFORMATION BAD
SALVAGE? no

BLK(S) MISSING IN BIT MAPS
SALVAGE? no

14001 files, 4160038 used, 34573030 free (14886 frags, 4319768 blocks, 0.0% fragmentation)


Why is this occurring and more importantly why is it not detected in single user mode?

Thanks in advance!
-D-