The reason why there is a big disparity the amounts is that you underestimated your income in the beginning of the year when you reported your estimated income to the marketplace. As a result of your income projection in the beginning of the year, you were eligible for marketplace subsidies of $11,000.
In reality, you made more money than your initial projection. As a result, you must to pay back the shortfall between your original income estimate vs the amount of income you earned in 2021.
Please read this IRS link for further details especially Question 4, which pertains to your situation.
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