I’m sure it will get sorted out but you’re not crazy…attaching mine so you can see, my trade in credit is 49,400, sales tax for me is 7.8% so I’m paying (72,940-49,400) * 0.078 = 1,836.12 in sales tax, which is exactly what it says for me. If I were paying on the full amount it’d be 5,689.32…...