MAC address list growing

I have a linksys WRT400N.  The N network is WPA encrypted, the G network uses WEP.  I have populated the wireless MAC address list with the 8 wireless addresses for devices which I own. It should only allow these wireless addresses to connect.
Twice now I have gone back to the list and found three additional MAC addresses in the list which I did not place there.  I have saved the proper configuration, I restore it, and all is OK.
Network Magic has never shown any other device attached to my network. 
Where are these additional MAC addresses coming from?
Everyone in my home is computer illiterate so I am sure they are not coming from here.  I have a password of course on the administration name.

Thanks for the quick reply. 
Well I think I have found the enemy and it is myself.  The three MAC addresses are:
00:11:43:71:40:d1
00:50:8d:91:CF:F3
00:50:80:d1:3b:26
The first is from Dell, the second two from ABIT and I have found them as the NIC addresses on two computers which I own.  I also have a Dell laptop so I suspect the first is coming from it though I haven't been able to find it's NIC address.
So I guess the only mystery is how these get populated into my wireless MAC address list. It looks like no harm, no foul.  I am not sure all my older devices are able to do WPA.  I will do some research.  Thanks again.

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