The capital gains income is added to your income to determine which capital gains tax rate applies, but the highest is 28%. We can't see your forms to know what other changes happened. You may have lost some other credits when calculating your tax differently. You can save and compare your forms before and after entry, looking for tax credit changes as well. Some credits, like EIC would be eliminated with that passive income level.
Reference: Topic No. 409 Capital Gains and Losses - IRS
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