Deductions & credits

This same thing happens to me.  I had 4 business vehicles last year and sold 3 of them.  The 3 I sold get their mileage deductions wiped out.  It also treats the sale price as a total gain down to the cent - there is no way to factor in the original price of the cars, which were substantially higher in all cases - so they most certainly were not profitable gains when selling.  I used TurboTax last year too, with 2 of the cars being in the TurboTax system.  There is more than one glitch in this flow. How do we report bugs?