college expenses enters but 529 distribution still being taxes

filling out turbo tax return for my daughter, using the free file turbo tax. She is a college student and we can and are claiming her as a dependent. We do not qualify for any education tax credits (like the AOTC). We took a 529 distribution in my daughters name. She is the beneficiary. The distribution was all used to pay for allowed educational expenses. The distribution was for $13,100 and her allowed expenses are slightly more than that at $13,400.  I have entered the 529 distribution into turbo tax and I have entered all of her educational expenses. Turbotax is still taxing the 529 distribution. What do I need to do to get this corrected?