Possible bug?

I have Mantis 4.9.7 on my iPad 1 with iOS v4.3.2

I was not sure what the triangles in each corner were for, and I was trying to drag them into the middle of the screen and what happens is this...

- CHAPTER is stuck in the top middle of the screen and does not go away.

- All the tiny chapter numbers are stuck (visible) down the left side of the screen.

HOW TO REPRODUCE:
You have to tap and hold the top left triangle, and then swipe it across the screen to almost the far right side with the iPad in landscape mode.

This is a possible bug, but it's pretty hard to reproduce, and you have to go pretty far to make it happen. Dragging to the center cancels the selection operation, so that's not a normal thing to do over and over.