Frame doubling when importing animated gifs

Hey guys!
It’s time to help out your buddy from serverside. I’m putting some animated gifs into a flash movie. I have about 20 gifs that I need to put in there, but the problem is that when I put some of them in there the frames of some are doubled. As in two frames appear in one frame and they’re on top of each other. This happends randomly. One some gif’s the effect happens, on others it doesn’t. Here’s an example:
http://alisic.net/byob/byobrace.html
See, on the first gif it doesn’t happen but on the second gif there’s this strange doubling. For reference, I’ve attached the second gif so you see how it should display.
Has anything like this happened to anyone yet?
The way I import them is I choose Insert -> New symbol and then I import the gif onto the stage. I’m using Flash 8.