I see the original poster started this thread in April 2020, but it looks like it fell through the cracks and was "orphaned" and thus never answered until now.
@ ejdjd1 correctly outlined the solution to this above. In my opinion, TurboTax should by default show all the boxes of the 1099-INT to everyone to avoid such confusion. Since TurboTax initially only shows Box 1, it's easy to see how one might mistakenly and reflexively enter the savings bond interest in the wrong box. As ejdjd1 mentioned, when one notices the check box to expand that screen and enters the full savings bond interest correctly in Box 3, then one can on a subsequent screen choose to adjust it for the amount previously reported.
