The situation with Arena and Coliseum rewards have been resolved, and players will now find their rewards have been adjusted to be consistent throughout all servers (you may need to restart the application to see the adjusted rewards). We will be retroactively crediting players with all of their adjusted Diamonds from their Arena and Coliseum rewards in five installments throughout the week, with the first installment already waiting in their mailbox.
Thank you for your patience,
The Disney Heroes: Battle Mode Team