I challenged a player in the ladder this morning and got that strange button placement :
The game : https://online-go.com/game/1288160
In another game I got challenged it was ok (because of “pass” button and then “undo” button I suppose ?
Also, you can cancel a ladder game ? It means you will lose by “cancel” and your opponent will take your placement ? Or that the game is simply cancelled and so you can avoid some ladder games ?