That question does refer to a NON-spouse beneficiary so you answered it correctly with NO. When there is a total distribution, the percentage that belongs to you is listed in box 9a.
Since there is an amount in Box 2a, the OPM already knows that you made after-tax contributions to the account. Since you have an amount in box 9b, this means that you have basis in the retirement plan. The amounts in 9b are used to calculate the taxable portion of your distribution in 2a. Because you have after-tax contributions that are not taxable to you, the taxable amount in 2a should be lower than the gross distribution in Box 1. But it sounds like they have already done the calculation for you both this year and last year.
You may want to delete the 1099-R and re-enter it to ensure your distribution is correctly reported.
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