I understand you must be logged in to each part of RR, however it is one password. If it worked for forums shouldn't it work for RR, the Wiki, or even Broadcastify?
I guess my point was not clear.
Yes, it is all the same password.
BUT, depending on your browser settings, you may stay logged in for a couple of weeks or more. So, if the OP had logged into the forums several days, or more, since his last login to the main page, the main page login may have 'expired' (timed out if you prefer), whereas the forum login has more time remaining before it has to be refreshed. I never see a new "login" request for the main page at the same time as for the forums. Usually, session expiration on the two areas are a week or more apart.