We have determined that a participant in another competition violated our rules by using multiple accounts to submit to that competition. As a result, the user has been stripped of all past accomplishments and disqualified from all competitions that they were participating in. You may notice the leaderboard shift.
There is strong evidence that this user was also submitting to this competition with multiple dummy accounts, and you may notice further leaderboard shifts as those are removed.
Please see the forum post in that competition for more details: https://www.kaggle.com/c/MerckActivity/forums/t/2925/merck-challenge-final-results/15918#post15918.