clock time increasing

My opponent's time increased when he had approximately 1 min, after that he had 2 min 10 sec in his clock and still increasing

My opponent's time increased when he had approximately 1 min, after that he had 2 min 10 sec in his clock and still increasing
Your past three games were 15|10 increment games. That means each player has 10 seconds added to their clock after making a move, so it's certainly possible to have the clock increase any time less than 10 seconds are used on a move.