We have a question about infinite-scroller?

[mexhfl]

After I created a project with infinite-scroller, there was a problem about distance of list items. Some of the list items were very close, some of it was far away, some of it even overlapped. I felt that the Y axis offset(translateY) in the list item was wrong, but demo was right, so I'd like to ask, what's the possible reason for this problem?