https://novaexchange.com/news/News
2017-07-14 15:00 - Some orderbooks was accidentally emptied
When removing and adding markets there was a mistake causing some markets to be closed that was not supposed to be closed. When they were activated once again the orderbooks was empty. All orders was automatically cancelled and refunded to users account balances. Sorry for this, luckily only a few active markets was affected by this.
i guess they'll be fixing it at some point. lol