Where did you make entries? 

In Depreciation for the vehicle?

Form 2106 linked to the Schedule C?

You should like use Chat or call support so they can help you figure out how you DOUBLED the amount. I think you maybe made an entry directly into the expense line that double all the calculated amounts. One or the other - NOT BOTH. 

Notice the line "Car and truck expenses [Adjust]" The Adjust means it adds it to everything else entered in other parts of the program.