How are self employed heath care premium deductions calculated in turbo tax?

From what I understand I should be able to deduct 100 percent of my self employed health care premiums as a schedule C deduction. I'm married, filing jointly with one dependent. The biz is in my name and made more income than the cost of premiums. AGI is 85,244. My insurance is through the .gov exchange and I underestimated my income for the year and will have to give back the credit I was getting. The premiums paid are about 12k, and turbo tax is giving me a line 29 deduction of 2,124. Am I missing something here? Thanks!