did you knead it a bunch with shortening after taking it out of the package? I know that helps mine...plus, i always add about 1/4 of whatever i need of wilton fondant to make it a little more elastic instead of soft.
plus, it looks as if you have rolled the fondant quite thin. fondant should be rolled about1/8 to 1/4 inch thick.
I'm no where near a fondant expert, but it almost looks to me like it's separating.