Steps to reproduce.

1. Add a RadListView to a form and set its height to around 68.
2. Set the ViewType to ViewType.Details.
3. Add several items so the vertical scroll bar would show.
4. scroll to the bottom and use the scroll bar up button to scroll up.

You will see that only half of some items would be shown, until you reach the top.

Resolution: When available space for rows is less than the height of a single row is normal to not see the hole row.