Like icopress pointed out already, this problem has been solved. Submitted bets can be seen in "my bets" (or similar) in your Betnomi account menu. It might take some minutes until bets are displayed there but I can see my submitted bets right now.
Maybe log out and log in again when bets still don't show up for your in your Account after waiting some minutes.
Looks like updates are in progress currently and will be finished when the World Cup starts in a few days.