1098t 1099q

I have entered these on my and my wife's returns for 3 years and qualified for I think a $2,500 credit each year.

 

This year I dug in a little deeper... it's her last year. TurboTax seems to have awarded me $2,500 this year as well. The T form shows payments for qualified tuition. Add to that the books and subtracting out the gross distribution from the q form I believe the difference is about $1,500.... Which feels about right I believe I spent $500 on books and I wrote a check for $1,000 towards her tuition this year.... 529 paid the rest  I guess I'm just curious how it awarded me $2,500?  I thought my net expenses not paid by the 529 would have had been in excess of $2,500.