I created a minimum project to reproduce the bug: https://github.com/NamXH/XamarinFormsImageScrollBug
Create a TableView with 2 TableSections, the first one contains an ImageCell, the second one contains enough TextCells to fill the screen. Scroll up and down a few times then the photo in the ImageCell will appear in some TextCells. It happens on not only iOS 8 but iOS 7.
Screenshot: