[BUG] Site randomly changes my login account across servers

So far, I have no debug info, but it appears that for some reason, the site changes my login account for another. It has allready switched through all acounts I have - North America, EUW and EUNE.

First, I didn't notice and I even happened to post from two different accounts in a short consequence here: http://boards.na.leagueoflegends.com/en/c/site-feedback/A4tAQ09t-when-you-use-cdn-it-should-be-cached-omniture-codejs-slows-down-the-site-horribly

So could I:

1. Control on which server do I log on?
2. Avoid switching the accounts like that?