incorrect amount in line 2 on 8606

[alex400]

TurboTax Premier (desktop) seems to generate an incorrect amount in line 2 on 8606.

I haven't had Traditional IRA balances for many years; each year I contribute the max (e.g., $8000) to my IRA and then convert it to Roth IRA a week later.

Thus no balance in Traditional IRA and just a few dollars I have to pay tax on.

I've checked my  8606's for the previous years, and they always had a 0 on line 2.

This year it's a large amount which, interestingly, matched the line 2 for my spouse (who was not doing backdoor IRA for a bunch of reasons). So, how come my 8606 - line 2 has some large amount instead of a 0 ?