I checked your tax file to make sure no adjustment was made to the exempt -int amount which could be the reason why the amount is different on form 1040. I tested the issue by reporting another 1099-INT with amount in box 8, the full amount carried over to form 1040.
I would recommend as Kris mentioned to delete the 1099-Int and enter it manually. Entering the form manually(not overriding the amount) will not void TurboTax Guarantee.
When reentering form 1099-INT, select I'll type it myself. Enter amounts as reported on your form.
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