Starting from today 30th March 2017, it seems that events in the karma log are no longer sorted on date. This results in very strange looking karma graph where the karma score points are anchored in abnormal positions while the line joining the points follows the chronological ordering.
I’ve checked that other user karmas also exhibit the same erratic behaviour.
May be the site software was updated between 28-30th March and this introduced the bug. Please forward this to site administrators