Form 1040-sr, Line 12b (charitable contributions if you take the standard deduction (Turbo Tax Deluxe)

We are married filing a joint return.  We have a charitable contribution of $2100 to our church.

When running the "Smart Check" on the federal return it says we have an unacceptable value on line 12b.

That value shows up to be $300 (as the unacceptable value)  The correct value should be $600 for us filling a joint return.

I change the value to $600 and re-run the "Smart Check" and it says there are now no errors.

When I do the check and/or final check before the "Filing" step, it goes through the "Analysis" process and it changes the $600 value back the $300.  I now have an unacceptable value again on the Federal return.

 

What do I do?