I received a ladder challenge from a much weaker player, which is fine, it’s what the ladder is for - you can challenge whoever you like and get an even rated game. But after I won… my rating decreased by a point from 1029 to 1028.
This is obviously no big deal, but it does feel like a bug.
Please be civil. There is nothing wrong with having computer opponents or playing unranked games. These criticisms are not relevant to Yujiri’s issue and come across as needlessly harsh.
Back to the issue, all I can tell from the rating graph is that the day started at 1727 and ended at 1706. In this time, Yujiri lost to 7k, and beat a “?” in their first game. (I think bot games don’t affect player rating?) The rating drop seems accurate for this situation, but there could be a bug. It also might be from the “?” player losing two games after Yujiri’s. The way Glicko works (if I understand correctly) is that past ratings are adjusted based on opponents’ subsequent performance. So an initial score of 1712 could be adjusted downward a few points to reflect that worse-than-expected performance from that player.