It's possible that the updates could have to do with the American Rescue Plan or something that was on hold because of it. Here is a TurboTax article about the American Rescue Plan.
If any of the following apply to you, then it could be the reason. Without reviewing your tax return it would be difficult to tell, but you can certainly ask for a line by line review to help you pinpoint the reason for the change.
Here's a link with more information.
