possible bug

I have a SEP ira as my only account requiring a distribution.  Using the table it should be roughly 4,300.  Turbo Tax says it should be 8,614.    I do get a civil service retirement annuity monthly for 29,891.   On the form for that 1099R there is a box for ROTH or insurance premiums.   I put in the amount I contribute for Insurance and maybe Turbo thinks it's for a ROTH.   This appear to be a bug.   I reported a repeatable bug last year dealing with Kansas taxes on civil service retirement payments that was repeatable and fixed for this year.