The hwbot point calculation or revision 7 was wonky, and messed up the rankings under load. Now the bug are ironed out rev7.1, a full recalculation of approx 870.000 rankings is in progress. As the site is under quite some load from the day to day submissions and visitors, this takes a long time. In the meanwhile, please be patient. The full recalc was started 48 hours ago. At a rate of one ranking every 2 seconds, approx. 90000 have been recalculated up till now.