When you go to save it - there's about 3 steps that you go through. "The first one is Animation Quality Versus Output Size"

Make sure the little bar is all the way to the top, towards the better image quality. That's the only thing I can think of that's making it that bad. Saving it to better image quality still takes a bit away, but it's better than what you're showing. (I tried doing it with the original that you posted and it didn't turn out as bad as the Gif one.)