I fixed it. I had to zero out both students, save the return, and close TurboTax. Then, when I reopened it and reentered the students, it calculated it properly. Note, however, that as I was entering the second student, the refund calculator completely deleted the amounts for the first student, which worried me! But, after finishing the second student, it recalculated properly for both.
While I was able to fix this problem, it never should have happened! And, I've read of other issues with these credits. TurboTax needs to look at it to see where they can improve the process to prevent these errors, especially where the 1098 does not report the actual expenses. The instructions are very confusing! (And I minored in accounting (economics major) and worked as a corporate accountant for many years.)
