Hello,
can’t help you with the Chinese unfortunately, but before someone does:
Let me reffer you to FAQ - Frequently Asked Questions under “game was scored wrong”
click Upper left ogs logo > settings > you can set it there. Never heard about any bugs with this one, so not sure what to think about your various experience… Maybe it was actually a correspondence but with “short” settings and both of you just made it in one sitting?
Let me reffer you here: FAQ - Frequently Asked Questions under the lightning symbol