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Turbotax 2021 Home and Business miscalculates the charitable contribution deduction when filing married jointly with standard deductions.  When you run error check, it calls up the Charitable Contribution Worksheet Line 12B with a $300 entry. 

When I type in the correct amount ($600 for married filing jointly since we contributed $1000 in cash last year) it fixes the problem.  But then the next time you run error check, it changes it back to $300.  And then it points out the error again.  No matter how many times I fix the problem, error check keeps changing it back to $300.

So there is no way to file taxes without using the workaround and submitting them with an error identified by your error check.