It was adjusted because of lag. There's nothing illegal or unfair.
illegal

Please see this help entry for more information:
http://support.chess.com/index.php?_m=knowledgebase&_a=viewarticle&kbarticleid=678
Please see this help entry for more information:
http://support.chess.com/index.php?_m=knowledgebase&_a=viewarticle&kbarticleid=678
When i played with a player name conanswastika at chess dot com his/her time was automatically adjusted when the time of conanswastika came as 3.00 (remaining time) it automatically adjust as 4.00 (remaining time). i dont know how it appears. please review...