Need help with what seems to be a bug?

Hi there,

I’m working on a little intro that is pretty much finished. I have attached the .fla so you can see what I’m talking about. In the 3rd part of the intro, you can see some beams coming down that sort of “project” the letters on the screen. But there is a problem with those beams. The first and second beam seem to be moving. Once it has expanded and is about to inset again, the beam moves just a tiny piece to the left. It should be@ the same place once it starts to inset. I’ve checked the coordinates, and it seems that everything is in order. But it still moves. Can anyone help me?