It's just a mistake. The same thing happened to me once, but the bug was fixed by Justspin without mentioning it to them-
What I don't understand is why so many complaints, Justspin does the job like all other casinos. I haven't had any problems.
Just to mention, when it comes to withdrawals it takes less than 24 hours via bank, same with electronic wallets. So I'm happy with Justspin.
Just keep up the good work Justspin @Alex_Justspin