New some actionscript help!

Im developing this button motion but I am having problens with the linkage.
In the fla you will see a column of boxes.
When u rollover a box it shifts down (or at least its supposed to)
But when u rollover it for the first time it doesnt move.
But when you rollout and rollover it again it shifts.

Can someone please look at this for me.

Thanks.http://www.gorillatowndesigns.com/fla/buttons.fla