Not a bug. One player has recently resigned hundreds of games. The other has completed only 14 games so has a very volatile rating. You can remove these players if you wish.
One way to solve the problem of volatile ratings is to set a minimum number of games played at say 50 games or more.
I recently created a tournament (http://www.chess.com/tournament/ponziani-opening) and I just went to check how many players have signed up so far-- but there seems to be a glitch. I set the rating range for the tournament to be from 1250-1450 yet there is one participant with a rating in the 700s and one with a rating of 1567! What's going on?