Currently if I open this page on Area 51 I see that some sites are marked with "beta user" which somehow implies I'm a user on those sites. However both Travel SE and Firearms SE are in beta now and I have an account on both and have some activity on both yet I have that "beta user" mark near Travel SE entry and don't have one near Firearms SE.
This looks suspicious. Either I should be listed on both or I should not be listed on either of the sites. If there's some clever logic behind who is listed where then a popup hint explaining what that mark means should be displayed.