Turbotax is screwing up my 1099-R

I got a 1099-R for taking a withdrawal from a post-tax pension plan into a ROTH IRA. 

 

Gross distribution $10,300

Employee after-tax contribution $10,000

 

The system is taxing me on the $300, but I didn't actually take the distribution, it got sent into my 401k (so will be taxed again when I retire), so therefore the entire transaction should have been tax free.

 

But ALAS Turbotax didn't take this into account and i keep getting taxed for the $300 income