So, you believe that even with a hash error, you may have had a bot betting unknowingly for you if two or more browsers were running?
(Of course you would have had to had activated them, so you would have known, but the thought is you were cheated out of bets?)
Little confused on the thought of what might be happening.

My main confusion in reading everything is how you thought you were cheated when you believe you were hacked via router or other method.
Was a wallet taken or remote malware installed (cryptolocker)?  You mentioned screen shots - Were you taking screen shots or you believe a hacker was taking screen shots.

You mentioned why it would have been a coincidence.  Easy.... A hacker having installed a JRAT isn't going after your machine instantly.  He is waiting/watching for you to be idle or in the background searching for wallet.dat files and logging your signins with websites.  Once he see something (money), he goes after it.  A hacker could have been in your system long before you lost anything and once he got what he wanted, he started messing with you (closing files, deleting, moving the screen, opening your CDRom drive.)

I am sure you ran fulls scans on the computer by now and fixed the hacked router (password / firmware / etc).