Basically what the title says. Yesterday I took part in #668 Div 2, did ok but sadly still lost a little bit of rating :(. The contest showed up on my page yesterday. Today I log on and the contest is gone from my user page. Is there a reason for this? I am a bit new to codeforces contests and I am not sure how they all work for sure so I am just wondering if this is a bug or feature.