I think there is a small problem in the "Add-on Download IDs" page of your site:
1) Go to My -> Add-on Download IDs
2) Perform an operation on any download ID (e.g. delete a download id or create a new one)
3) Now try to perform another operation on another download id (e.g. "New"): Operation fails and you are redirected to https://www.akeebabackup.com/index.php.
You have to go again to My -> Add-on Download IDs to perform a new operation.
This happens even if the "operation" is simply to change the sorting order.
Cheers!
Sergio Manzi