df -h commnad reporting in excess of 100% used

       I have several systems, all Solaris 10, that are reporting disk utilization in excess of 100%.  This includes both zfs and ufs filesytems.

#df -h

Filesystem             size   used  avail capacity  Mounted on
fd                       0K     0K     0K     0%    /dev/fd
/dev/md/dsk/d4          14G  8192E     0K 61578184862524% /var
swap                   114G   386M   114G     1%    /tmp
swap                   114G    56K   114G     1%    /var/run

Du reports normally.

#du -sh

7.0G .

    The filesytem varies from server to server and from time to time on the server.  It goes away on a reboot or sometimes on it's own.  I've tried df -k as well and it's the same. 

Does anyone have any idea what might be causing this?  I'm beginning to think it's a bug in the Solaris 10 version I'm using.