Practicing Fondant

Two layer white cake, buttercream filling, Satin Ice fondant, buttercream piping and FAST dots! Wanted to try a fondant other than Wilton's. Like the flavor of the S. Ice....and it was easy to work with. I still don't like the fact that when I cut my fondant cakes, the fondant separates from the buttercream iced cake side. IS THIS NORMAL??????