Why is my State Refund from 2021 different from what I expected and what is shown on the 2021 tax file?

Why is my State Refund from 2021 different from what I expected and what is shown on the 2021 tax file?  The 1099-G I got in the mail has a different amount than the refund shown on my California return.

 

Did I make a mistake and the FTB corrected it ?  How do I know what the mistake was?

 

Thank you