@luithe3rd "Sometimes the refund amounts don't recalculate at all when choosing "Prior Year option" and there is a $10,000 difference in Earned Income."

Maybe because you're using an example when 2020 earned income is higher than 2019?  Some examples would help.  But as others have pointed out, if you can't do the calculations manually, you shouldn't be using a tool that just does it faster.