Yes, moving is the reason

来源: 于 2005-10-12 13:59:37 [旧帖] [给我悄悄话] 本文已被阅读：次

Did you notify CIS for your moving?
There were several people who moved recently got the same message.Please go to immigration.com to check that.
It's approval or registration.

It's still possible that your case was approved before Oct1 but the notification came 2 weeks later. However, more likely it's a recognition of your address change.