unable to log on

the league of legends boards have been doing this thing to me. i'll go to the boards to log in, and it'll tell me my username and password aren't correct. that being said i did finally get on but after many minutes of struggling. i have 0 problems logging into the game client, but the boards insist i have the wrong pass or user. clearly this isn't the case. after enough harassing it finally let me log in but jesus. why does this website not think i have the right user/pass?