Duplication trouble with scrolling menu

Can anyone tell me what I am doing wrong with this scrollbar. It only seems to duplicate the strip every second time.

I can’t seem to figure it out, and I am still learning how to use flash.

I ahd it working on the main timeline in another test I did, but due to masking and other things, I want it contained within the movie clips as I have here (see file)

Any flash guru assistance would be great.

Cheers.