Ghost user account

Question

I'll start by apologising, I have searched but was unable to find anything similar to my post, so if there is already a thread with this subject please point me in the right direction.
Ok I have two user accounts set up on a PMG5 dual 2.3GHz 4.5GB ram running 10.4.11, 1x admin account 1x other account, now sometimes when booted 3 accounts appear 1x admin 2x other.
If I go to system preferences > accounts it only shows 1x admin 1x other.
If I go to Users folder on the HD I have 1x admin 1x other 1x shared, all normal right?
admin is the main account, other is used so the computer can be put to use if the main user is away
eg. meetings or holiday it can only be used for surfing and burning
any clues anyone

Answer 1

I sure you get the account name 'Other' if you set up a user account and do not fill in the Name field which is what I set up for the managed account, the 'root' or superuser is not enabled.
the second 'Other' account does not always appear at startup perhaps once or twice a week if that if more of an annoyance than a problem, would still like to figure what's going on though.