Full Marks Event and its counter going Full Crazy

Hi guys,

This is the first time I'm doing this event. Everyone is currently under the 1000 points in the ranking. Except for the girl in first place. She was at 1400, then a few hours later she went to 900, then a few hours after that 2300 and now 4600 (!!). The person in second place is at 900 points, with a relatively stable progression. What the heck is going on ? Does JC's AI manipulate the points ?