All BlackBerry Servers report the exact same activity statistics in the "BlackBerry Enterprise Server Activity" report.
This can happen if all BES servers are configured to write log files to the same central location, for example Shared Storage on a SAN, or a File Share on a Windows server.
In this scenario all logs from all servers will be processed during the log file gathering tasks for each BES server.
Work Around:
Configure Each BES server to write to an individual subfolder in this shared log location.
