AirPort Express shows lowercase in AirPort Utility
I use an AirPort Express 802.11n (v7.5.2) to extend my wireless network with a Time Capsule 802.11n (2nd Generation / v7.5.2) as a base router. When I enter the 'Logging & Statistics' of my Time Capsule via the AirPort Utility (via: Manual Setup > Advanced > Logs and Statistics > DHCP clients), I found out that only the name (Client ID) of my AirPort Express is changed in only lowercase characters (from Luna into luna), while all the other devices (like my iPad, iPhones, iPods, printers, Apple-TV, etc.) contain their original set of upper- and lowercase characters.
Can someone please explain to me why only the name (Client ID) of the AirPort Express is changed into lowercase?