Do I understand correctly that the bug occurs when collapsing/expanding chapters? If yes, then this is due to a bug in the smart animation of auto layout frames. There are two solutions here:
- Instead of “Smart animate”, use “Instant”.
- Wrap your auto layout in a frame of a fixed height (set the height equal to the height of the device), and also change the overflow scrolling behavior (from “No scrolling” to “Vertical”) of this frame.