hmmm..... I checked it out and indeed it shows rather strange (every other gif viewer I tried shows it fine). I looked at the gif on byte level and there is nothing wrong with it; the stucture is absolutely fine. When the image is interlaced however, windows picture/fax viewer shows it fine. It seems like a render bug in the pic/fax viewer though (It always renders the pics (in a strange way) before it shows them if the pics are below a certain size or colors)
but, if you don't trust it, here is the interlaced version (6 bytes bigger then the non-interlaced though
)