1098-T made no change to taxes

I entered my income (about $10,000) and taxes paid and saw the amount of my refund. Then I entered my 1098-T information (about $15,000 in box 1) and that I am full time student and have not used 1098-T deduction before. I expected my federal return amount to increase but it did not. Any idea what is going on? Let me know if more information is needed to help me. Thanks, Phil.