iPhone 4s and iPhone 5
iOS: 7.1.1, 7.1.2, and 8.2
Description: Portrait Orientation Lock is on but the device is rotated sideways.
Cause: Rotating the screen with AssistiveTouch.
Recreate By: Open an app that can be rotated to landscape (Safari, messages, mail, stocks, etc.) and turn on portrait orientation lock from control center. Then open AssistiveTouch (go to Settings > General > Accessibility > AssistiveTouch for instructions how to use AssistiveTouch) and go to Device > Rotate Device and pick Left or Right. The device will rotate but there will still be the Orientation Lock icon in the information bar.