My example comes from a different worksheet. Your worksheet appears to be the one used when the student-beneficiary is not your dependent.
Your worksheet needs an amount on line 1 (apparently $22,032). You should send the IRS a copy of that work sheet, in addition to proof of your expenses. I believe Part II of that worksheet itemizes all of your qualified expenses. That should help your case.
Read the IRS carefully to be sure you understand the issue. The non dependent student may have been the red flag. But a 529 distribution is allowed for a non dependent's education, as long as the student is the beneficiary of the 529 plan.
