I make a custom order it was tiny but i still put the shipping amount for first class. I see the purchase and etsy changed the shpping to 2.00. Since the entire order is 7.00 and just 2 oz I make a 'flat' which was accepted with the exact description here, but when my son got to the post office they wouldn't take it, they said it had to be done first class which without our discount was 4.50. I also get a ding because it showed as late shipment because with the flat tracking it shows pretransit. How and why would etsy change the shipping that I enter ?