You answered a question wrong when entering them as your dependents. You should have indicated they lived in your home for the entire year (absence for education is considered living in your home). You should have indicated that they did NOT provide over one-half of their own support. You should have indicated that no one else in the home supported them. You should have NOT checked the box for not eligible for employment on their Social Security number entry screen.
If all of your entries are correct for them, then delete them as dependents and re-enter.