I also registered to the website (just to take a look at it, off course) and had a same experience. Tried to log in using the email address and the password I had set. But they didn't work.
After a few minutes, I checked my email and noticed a new message from them including a new username. I logged in to the website using the new username.

The funniest part of this casino is how you should deposit. Look at the message they sent me.



You can check the transaction history of the BTC address they gave me using the link below.

Pitibet deposit address

They don't even create a unique deposit address for each of users. They give a single address to all users and ask them to provide their transaction ID.