The client may not have shown it but the time was being added on the server side. If you check the game on the website archive you can verify the server timestamps.
edit: it looks like you may have been disconnected at the end since you had over 4 minutes to make your last move and it you lost on time.
In a winning position I lost !! Finishing like in hell blitz because no more 10s after each move! Check my last game and you will see that it was well started in a 15-10 mode! Not happy at all !