Device: iPhone 4s
iOS: 7.0.4 and 7.0.6
Description: Scroll bar in the notes app is shown stopping at a point half way down the screen.
Cause: Ejecting a Bluetooth keyboard several times in quick succession.
Recreate By: Connect an Apple Bluetooth keyboard to your device (Settings>>Bluetooth) and open the notes app. Type out enough text that you have to scroll to see all of it with the Bluetooth keyboard. Then, push eject on the keyboard twice rapidly.