I also found that TurboTax is replicating the $5150 amount on lines 1a and 1f of the 1099-R Summary form. This is wrong; line 1a should be 0. If I override line 1a to 0, the -5150 value on line 7 of From 8606 goes away.
Why is TurboTax replicating this amount on the 1099-R Summary form?
Note my 1099-R form from Vanguard has $5150 in box 1, box 7 distribution code G, and IRA/SEP/SIMPLE checked. Again, this 1099-R form is for a one-time IRA to HSA funding distribution.
