Timer bug.

In a blitz, when i reached 10 seconds, 30 seconds were added.

This is the game:


Thanks for this great chess platform.

P.S. you can give the victory to my opponent.

Not a bug. Your opponent added the time to you.

Maybe your opponent gave you extra time at that point using the "+15 seconds" button twice?

If you don't want your opponents to give you time you can go to lichess.org/account/preferences/chess-clock and change it.

Thank you for the answers. i was not aware of this functionality.

It's not a mistake, maybe, but the opponent added time