First, your gate cost is correctly recorded at 450k, given that you have rented 9 50k gates. Your starting gates at your home base is free of charge for the month so they don't show up on your financial reports.
Next, as someone has mentioned, your starting cash is 500k. The cheapest plane is more expensive than 500k and you need cash to order the planes. For what I can see, you have not successfully ordered any plane. No money has been deducted from your account and therefore no plane have been added. If you try to buy a new plane again, you would receive the warning "You do not have enough cash for this purchase." in red.
That said, there is nothing to fix because all your finances appear to be correct.
