Software Update Changes the amount of Federal and State Refund after its been filed.

[Krazyrae]

I had a need to look at some 2020 information so I launched TurboTax Deluxe. The application indicated there were updates so I applied them. When I looked at my return I see that the amount of refund for both federal and state are now different from what I electronically sent when I filed.  Unfortunately, I'm not able to go back to see my return as it was when filed and I didn't print off all the documents like I usually do.  Is there an easy way to determine what changed? Should I file an amended return?  

Thank you

(1) Is this normal behavior? (2) Should I file an amended return? (3) Is there an easy way to tell what changed?

[HeatherPLO]

To access a prior year's return, please follow the instructions in the Help Article here.  This will be the information as filed with the IRS. 

In addition to this, you can get that information directly from the IRS following the information from the Help Article here.