TurboTax says I get a $528 refund but just received letter from IRS saying I owe $1050

I submitted my taxes back in April 2021 using TurboTax-2020 and initially it said I owed about $1,000 for taxes on my unemployment benefits.

 

A few weeks afterwards, I learned the Biden administration had waived unemployment taxes and so I logged back into TurboTax to double check, which said I would get a $528 refund. So I cancelled my IRS payment.

 

However, now in June I receive a letter saying I owe $1,050 (including $5 interest) and TurboTax still says I get a $528 refund. 

 

What gives??