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

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?