I just had this game: https://online-go.com/game/11585462
The game offer I accepted said quite clearly: Time Control: Simple: 9 seconds per move. When I accepted the game, the clock showed some 40s or so, and incremented by a few every time I made a move. Clearly fischer timing. Except that during the endgame, I suddenly lost on time while it was still showing about 30s for both of us because I finally took more than 9s on a single move. This is a very serious bug. Unfortunately I don’t have any proof so I won’t ask to get the game annulled, but hopefully I can get the developers looking into this.