If the OP had filled in the education credit section before going back to the MY INFO tab to indicate they were a dependent then that could explain the change in the bottom line. They may need to review the education credit section again since they were over the age of 24.
FYI ... the program works best when you follow the interview from start to finish in the order presented. Going back and making changes in the beginning can require a review of the rest of the interview especially the state tab if you make changed in the federal section.
