How come on the top it says bankroll = 90 and below on the dashboard invested = 697 ?
"invested" doesn't change as people play. "bankroll" does.
If you invest 10 BTC and someone wins 2 BTC of it, you're still contributing 10 BTC to "invested" but only 8 BTC to "bankroll".
It's an odd way of accounting but it's the way DB has always done it.
This is bad news. Why has dicebitcoin emptied the entire cold wallet into the hot wallet

The bankroll is pretty much empty. It would be surprising if they still had coins in the cold wallet, since they no longer have coins on their site.