I think I figured it out and I was wrong.
On "Tax Payments by Quarter" you fill out your withholdings without any estimated tax payments you made.
On form 2210 it displays these values PLUS any withholdings you recorded in TurboTax on other forms.
In my case the values were very close and it looked wrong. So I actually think that my return is correctly filled out by TurboTax.
The reason I thought there was a bug here was because I think there *really is* a bug in a related case. Originally I filled out my "Tax Payments by Quarter" incorrectly. The value did not total up to my annual withholding. On the "Review" step I was presented with an error to correct. When attempting to fix that error, TurboTax displays form 2210 with three input boxes on line 19. But it only has the H1 and Q4 boxes filled in and with the incorrect values. There is no way to actually fix the entry here. You have to go back to "Tax Payments by Quarter" and update it there total correctly.
Hopefully this helps others figure out there own situation.
