I just played a custom pvp duel with a friend (the option where there are no rewards). I've never played this mode before so I wasn't sure what to expect. I won the game, and somehow I went from 914 electrum to 994 electrum. I know that this is definitely not supposed to happen, so I was wondering if this was only me and a problem with my account or something.
Edit: Played again with the same friend, won again, and no electrum gains this time.