I just played a 10/5 match where it seemed like the increment was completely broken. It gave me 5 seconds increment consistently, but gave my opponent 10. Needless to say, this is not good. Seemed like sometimes it gave the opp 0, sometimes 10, but never that I noticed, 5.
If you saw your opponent get more time then it was related to lag compensation.
https://support.chess.com/article/423-why-did-the-clock-times-suddenly-change-the-clocks-seem-broken
I just played a 10/5 match where it seemed like the increment was completely broken. It gave me 5 seconds increment consistently, but gave my opponent 10. Needless to say, this is not good. Seemed like sometimes it gave the opp 0, sometimes 10, but never that I noticed, 5.