Anyone have ideas on the following :

Setup
WL500g-d running 1.9.4.6 WPA-PSK and WDS to a WL500g running 1.9.4.6 in AP mode. ESSID is hidden.

Cable ------ WL500g-d ------------ WDS ------------WL500g AP Hybrid

The setup works, DHCP works, lan access or Wlan access works form both.

I have restricted access also using MAC addresses.


PROBLEM
Each morning when I check my router, I am noticing 2 DHCP enties which should not be possible they are not from my physical networknor are they in my ( short ) list of allowable MAC addresses.
How can DHCP be allocating an IP to these MAC's when they shouldnt be able to get in in the first place?

I have tried the following :
- turn off the second WL500g, but in the morning they are still there and have been reallocated ip's.
- turned on logging accept & denied, searched for the ip in the list but dont see any.
- Blocked all mac's, even tested trying to get my PDA & Laptop to connect and that doesnt work I cant get an ip so how the hell are the two entries below getting in and getting one allocated.

Here's my DHCP list, each morning there are two entries I can account for.
Code:
Host Name       Mac Address       IP Address      Lease
Qtek_2020i      00:09:21:D4:44:1E 192.168.1.3     36029 secs ( My PDA )
                00:0E:A6:98:A8:9C 192.168.1.4     20898 secs ( WL500G )
fujit-lxp       00:0B:5D:78:BB:E8 192.168.1.6     70805 secs ( My Laptop )
                E1:6C:D6:AE:52:90 192.168.1.8     Expired ( ????? )
                E9:EB:B3:A6:DB:3C 192.168.1.9     Expired ( ???? )
The Leases with time against them are from the previous day. Which is also odd as the unknown ones are Expired. ( I have tired rebooting the router and makeing sure everything is clear.)

The only assumptions I can make is that it WDS, but that shouldnt be possible either as I do not allow anonymous and have specificied the MAC of the WL500G in the WL500g-d and visa-versa.

I really do not like the thought of someone getting into my network considering I work in security )

Any ideas would be gratefully recieved.

Cheers.