Some reports say the bug is a read only cache leak related to the CDN they use to serve your region, and that the other accounts you see when the bug is triggered are from people using your same CDN server (same region). Still no official confirmation/response.
Hello,
This is correct. The cache has now been totally deactivated and you should not get the wrong balances displayed on this page.
We will monitor the situation closely but no account could be compromised because of this.
Please accept our sincere apologies for the inconvenience.
Have a good day
Raphael