Deductions & credits

My turbotax still cannot show the corrected amount. It's already updated to the latest version.

I bought the Volt 2019 in July. I think the credit should be 50% of 7500, which is 3750. Correct me if I'm wrong.

In turbotax I've put the year, vin, maker, and model. It showed up the 7500 in the end. (I've put 'Chevy' in maker as it suggested to find out the phase out percentage). 

On form 8936, it only shows 7500 on Part IV B (A is empty), and 16 and 17 are all 7500. Is there any part I need to manually correct?

I've seen some people mentioning the number will be corrected in the end. But so far I haven't seen it. Where it would happen? Can some one please give more details? Thanks!