Upon installation of Norton Security AntiVirus and Symantec Web Security from Android device App Center Agent, a second and duplicate device object, related to the same physical device, appears in the Devices page of the App Center administrator console.
Two devices (Dell Venue and Asus Transformer) have duplicates objects (in red rectangles)
The App Center Agent on the installing device was built for App Center 4.3.4. Norton Security AV and Symantec Secure Web were installed on the device before the agent was rebuilt for App Center 4.4.
The Android App Center Agent must be rebuilt after upgrading App Center 4.3.x to App Center 4.4.
In App Center Admin page browse to Settings >> Device Clients >> Android Client