Mismatch between Turbotax determined taxable amount for my 1099-R form and that in the Form's Box 2a

Hi, I'm puzzled by the mismatch. My 1099-R shows:

Box 1 (Gross distribution) = $8,323.14

Box 2a (Taxable amount) = $90.88

Box 5 (After-tax contribution) = $8,225.89

Box 7 (Distribution code(s)) = G

 

But Turbotax shows me the following table which shows a very different taxable amount i.e. $188.00:
==== Begin table ===

Retirement income results
Here is how your retirement and IRA distributions affect your income.

Pension and annuity distributions: Total $8,323.00 ; Taxable $188.00.

===== End table ===

 

I have only one 1099-R form in the return. Could you please help me on this?

Thanks!