fixed items overlaps on fast scroll up

[marioloncarek]

I have copied your summaries example since i need the same effect. I just renamed containers and left everything as it is on your example site. Problem is showing when you try to scroll up little bit faster than usual, or use scroll-bar to go up. Then all the div's that are selected with your plugin (in your example .summary) start to overlap or collapse into each other. The bug is only showing on scrolling up and only when you try to do it fast. Have you noticed this? I could find only similar bugs but they are not having the same problem as me here. Thanks in advance!
PS Great plugin