The peer 3dnbn is a member, but the UID is not shown. It seems to be a bug exclusively with HEAD v1 messages.
3dnbn
Fixed in: https://github.com/duniter/duniter-ui/commit/725a734c34a9e764c50f573d2df9ec6d15034713 + https://github.com/duniter/duniter-ui/commit/f07406b4ba78108ff38fc5a1dd0dc2fad6c19d70