This can happen if you made the dough ahead of time and did not store it well. You need to wrap the rolls using a baking sheet lightly in plastic wrap. You also need to refrigerate the shaped rolls overnight so that they are fresh enough and to avoid splitting. When it is one hour from baking, you need to remove them from the refrigerator and allow them to rise and then bake as recommended. You can go to http://allrecipes.com/howto/dinner-rolls/ for more reference.