When you open the notes section everything appears ok. When the iPhone user attempts to scroll up, everything below what was originally seen on the screen is black. Also, when they try to click in the notes (to make it full screen), the notes have either been blank or when they scroll up (to view the remainder of the notes) the screen is again black. Please see the four pictures below.
Picture 1 = How the notes section appears when you first open that section (it initially looks ok)
Picture 2 = Shows the black area when the iPhone user scrolls up to view the bottom of the notes
Picture 3 = Shows what happens when the iPhone user clicks in the notes to view it full screen then scrolls up (black area when you scroll up)
Picture 4 = Alternate view of notes in full screen mode showing the black area
*Tested on iPhone 6S on 12-15-16