You're referring to Extras & Info? It's a glitch. Turning PfD on or off doesn't have the slightest influence on what the update servers think about your device. Even though it has been stated otherwise multiple times on these forums. The servers check for the firmware and/or OS version installed on your device. Nothing more, nothing less. I for one would say you're still running Cyan. You could simply check for the new features that come with Denim. Like the new camera features for example. If you don't have them yet, you're still on Cyan (like most of us).