Flash won't export gifs fully transparent?

So I've been using Flash for a while and never had any issues before, but suddenly when I export a transparent gif, not all of it will be transparent after publishing. For example, if I have a gif of a dog I drew wagging its tail and I want it to export with a transparent background, the rest of the dog will show up transparent, but as the tail moves, a big white box appears around it.

I'm importing the images from Photoshop layers and everything else will work fine, it just seems to pick random elements from the animation and not publish them.

I publish them with these settings http://ift.tt/1uugJbK

Help?