Hello,

I am publishing here the resolution of the problem to inform the community. An email has been sent to the player Stagolee.

The 0,005 BTC from the stagolee's deposit has been sent to his account, with a bonus of 0.001 BTC for the inconvenient.
SupraBitcoin is using the Blockchain API service for the transactions and I received what my website has considered an illogical callbacks from them.
At first, the API told me the transaction was complete but then they told me his transaction only had 5 confirmations. Maybe my server saw the callbacks at the same time and in the illogical order, I don't really know how it happened. My automated system could not handle this exception, hence the bug.

I am really sorry, I should have foreseen this scenario when programming the site. This problem should not happen again, the code has been fixed.

I hope that this problem will not give you a too bad image of SupraBitcoin.