This user competed in Round #623 in Division 2 and received rating change for it, even though he was 1900+ before participating and this round wasn't Div. 2 only. How was this allowed?
Update: I also noticed that there were several competitors (here, here, here, and here) who competed in the Div 1 version but were rated for Div 2. Again, I'm not sure how this was allowed.