DId you claim the registration fee in the education section, or anywhere for that matter, on your 2015 tax return? Basically, the 1099-MISC was not sent in error. The school had to report the fee you paid as taxable income. When they paid it back to you, they rightfully wanted to report it to the IRS, so they could get back the taxes they paid on that income.
For you what matters, is if you claimed your registration fee as a tax deduction on your 2015 return. Did you?
