Using 2019 income to calculate 2020 EITC

I read the below information but still unclear:

 

"Earned Income Tax Credit (EITC) Relief. If your earned income was higher in 2019 than in 2020, you can use the 2019 amount to figure your EITC for 2020. This temporary relief is provided through the Taxpayer Certainty and Disaster Tax Relief Act of 2020."

 

I don't understand why a higher income would result in a higher EITC. I thought the higher your income, the lower the EITC.

 

I earned less in 2019 and received a higher EITC. My income for 2020 is higher and TurboTax shows a lower EITC.

 

Please help explain.

 

Thank you.