Por que o gpg mostra uids diferentes em --list-keys e --list-secret-keys?

Question

Eu adicionei um novo uid e revoguei um antigo, usando o comando --edit-key.

Aqui está minha saída (já substitui o email por "uidx"):

▶ gpg --list-keys; gpg --list-secret-keys 
/home/xxxx/.gnupg/pubring.gpg
-----------------------------
pub   2048R/A6573CCA 2012-07-26
uid                  uid1
uid                  uid2
uid                  uid3
uid                  uid4
uid                  [jpeg image of size 3757]
sub   2048R/88364032 2012-07-26

/home/xxxx/.gnupg/secring.gpg
-----------------------------
sec   2048R/A6573CCA 2012-07-26
uid                  An revoked uid5 here.
uid                  uid2
uid                  uid1
ssb   2048R/88364032 2012-07-26