Are you taking a fee on every deposit or something? Depositing 1 BTC gives you 0.998 BTC in your balance. Annoying for your friends of oshi! promotion-thing too as well.
I had the exact same problem, I had to flag it with live chat who didn't understand what was happening but refunded me the fee.
They also gave me 10 free spins, but despite three separate chats with support they where not able to help me get them working.
Was a dreadful first experience and I'm now avoiding this casino