Bootable Volume Permissions Keep Changing

I've got a strange problem.
I have two bootable backup volumes on different physical disks...one is a 3.5" firewire hard drive and the seceond is a portable 2.5" firewire hard drive. The permissions of bootable volumes (the volume itself, not the items inside) are supposed to be:
system: Read and Write
admin: Read and Write
everyone: Read only
And, the checkbox for "Ignore ownership on this volume" should NOT be checked.
However, over time, the permissions of these volumes will somehow change to:
my username: Read and Write (my actual admin username)
(unknown): Read and Write
everyone: Read only
And, the checkbox for "Ignore ownership on this volume" will become checked--which totally messes up a bootable backup.
If I run Diskwarrior on the volume, the correct permissions for that volume will be restored. BUT...why is this happening?
I'm pretty obsessive about having having bootable backups and have been doing them for years and years. I don't ever remember this happening before. I'm pretty sure it wasn't happening when I was running 10.5.7. I upgraded to 10.5.8 about 3 weeks ago.
Finally, the permissions of these volumes will change even if I haven't done a backup. I'll just mount one of them and voila: the volume permissions have somehow changed since the last time.
Any help or advice would be greatly appreciated.

that is very strange because i have the opposite problem. The permissions of my actual hard drive keep changing from
my username: Read and Write (my actual admin username)
(unknown): Read and Write
everyone: Read only
to
system: Read and Write
admin: Read and Write
everyone: Read only
did you find out what was the source of your problem?

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Oct 10 16:58:47 macimgsrv.intern bootpd[20296]: DHCP INFORM [en0]: 1,10:dd:b1:ea:d1:e5
Oct 10 16:58:47 macimgsrv.intern bootpd[20296]: ACK sent <no hostname> 192.168.2.112 pktsize 300
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