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Thanks, but this is getting weirder and weirder.   The amount (around $5k) was already showing up under "other taxes paid" as paid with the extension.  Just now I went to Schedule 3 line 10, and a smaller amount (around $4k) was already there, as well as on line 15.  The $5k amount is still showing up in bright red letters at the top under "Federal Taxes Due."

 

I note that on form 4868 (extension of time to file) the $5k figure is listed on ine 6 and 7.  

The Box "A" (freeze the amounts flowing to this form) is checked because turbotax warns me not to uncheck it.  Is that a mistake?