I need to amend my return but my refund amount changed after software update. Please help!

I need to amend my 2020 tax return so I opened it yesterday, after TT software update, then saw a huge difference in my refund amount from my original e-file (done on May 3, 2021).

 

I saw few other posts regarding this topic. However, they all seemed to be the ones who filed early then later impacted by the American Rescue Plan (first $10,200 of UI not taxable).

 

My case is different in that I filed mine on May 3 (after the law change and Turbotax software update).

 

My original e-file showed Federal refund of $4600 and I owed the State $7. I still have not received the Federal refund.

 

Now, it says my Federal refund is $1500 and I owe the State $47.

 

What gives? Since I filed my return after the TT software was updated based on the American Rescue Plan, I can't think of any tax law changes that would impact my refund amount this much?!

 

I need to amend my return because of an omission but I'm afraid doing so will dramatically reduce my refund incorrectly?!