There could be an error in your wages and income entries. As you indicated in your question, the obligation to repay part or all of the advanced premium tax credit is determined on how your household income compares on a percentage basis to the federal poverty line. According to the IRS, if the amount on line 5 of Form 8962 is "at least 300 but less than 400," then the amount on line 28, for any filing status other than single, will be $2,700. Because your return is currently showing an obligation to repay $2,700, it would appear that your household income is falling somewhere between 300% and 400% of the federal poverty line, which as you noted is not correct because your income is greater than 400% of the federal poverty line.
In the Wages & Income section of TurboTax, please verify that your income entries are correct and make whatever changes are appropriate. Additionally, under the Affordable Care Act, your health insurance cannot exceed 8.5% of your household income regardless of your income level. You are entitled to a premium tax credit to the extent the cost of the benchmark silver plan in your area exceeds 8.5% of your household income. If you received an advanced premium credit amount in excess of what you were eligible to receive, then you likely have to repay that excess amount.
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