время противнику больше добавляется, почему?


Both of your games were increment games, with a 15 minute base time and 10 seconds added after every move was made.
https://support.chess.com/customer/en/portal/articles/1444850-how-do-the-time-controls-work-in-the-live-chess-
That is most likely what you were seeing. Another possibility is that you were seeing lag correction.