Also, it seems the bold style isn’t consistent: I see all my games with my nickname outlined, but my friend has it otherwise - her opponents are displayed as bold.
The bold face name is the person whose turn it is to move. It’s correct in the boards shown. Your game with skamman does appear to be Chinese rules, as the score estimator is counting stones on the board.
Maybe it is important to add that this is true only for the estimator. The end game score will be counted according to the ruleset chosen by the players of course. They are two different things.