You may need to do your updates to the program if the calculation is not working correctly. The refund should revert to the original amount once you enter over $600 in foreign tax (if filing married-joint) as then the deduction would not be automatic and require form 1116 to be completed in order to get the foreign tax credit.
You would have to contact TurboTax so an agent could look at your return with you to report a problem with the program. Here is how you can contact TurboTax:
Contact TurboTax
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