That is due to an IRS error on the qualified dividends and capital gains tax worksheet in IRS publications that the IRS set out a notice in May. TurboTax has been updated to correct that IRS error but if you filed prior to that then the IRS will correct it and send an additional refund.
See: https://www.irs.gov/forms-pubs/error-in-qualified-dividends-and-capital-gain-d-tax-worksheet-in-pub-...
https://www.journalofaccountancy.com/news/2019/may/irs-corrects-error-schedule-d-tax-calculation-wor...
**Disclaimer: This post is for discussion purposes only and is NOT tax advice. The author takes no responsibility for the accuracy of any information in this post.**
