Hello,
You should not see 3 starengine9.exe processes in Task Manager. This is the process for Antigen's anti-spam engine, Spam Cure.
I would consider opening a ticket with the Antigen/Forefront support team if cycling the Exchnage/FSE services does not address the issue (or rebooting).
You should see one starengine9 service.
Thanks
Robert
Rob M