bugs with the export transport. (Grand Theft Auto 5)

I take the transport to the warehouse, I decided to go to the laptop that would sell one car and for some reason the middle class was considered the highest,and the standard for average. Tried to sell higher rather average,the fee for the transport was 125000$ and a modification of the$25,000.Sold average standard rather turned 75000$ Commission$ 15,000 or modification,and the highest which is the highest 200000$ and modification of 40000$. It's my way or point some bonuses? And nezarat for allegedly using glitches? The proof is there.