I know this response is way late! LOL But thanks for your advice! I think it was a combo of me using too much icing and not letting it sit long enough before covering it with fondant!! Thanks again for your response!
So when I first cover a cake with fondant, I can get it really smooth and nice looking, but a few hours later it like sags and ripples at the bottom and looks like crap! How can I prevent this from happening???