BUG: time counter starts too high (but timeouts correctly, so you see time remaining when you don't have any)

Hi, today I’ve encountered a bug, when playing blitz 10s/stone, the counter was starting aprox around 25seconds.
That means it never hit the 10s mark when it starts countdown and also it means it did timeout around 15seconds left.
game https://online-go.com/game/3519476 and the previous against the same person too.
He says he encountered someone with simmilar problem yesterday too.

edit: forgot to mention, for the oponent, it counted correctly and it was showing and saying the 10s countdown.