Same things goes for here, you're charged the original/highest price of the merchant and not the said price in the window, for example it show you'll have to pay 5 emeralds originally for a chestplate but you have good reputation so it shows 3 instead, but after the trade is done and you put in 10 emeralds to buy it, you pull your remaining 7 out but the number 7 will change to 5, charging you the original price for it.
I don't know if it'll help the ones going through the tickets to determine why it's doing it or how it can be fixed, I explained it the best I could too, hope it'll get fixed
Same things goes for here, you're charged the original/highest price of the merchant and not the said price in the window, for example it show you'll have to pay 5 emeralds originally for a chestplate but you have good reputation so it shows 3 instead, but after the trade is done and you put in 10 emeralds to buy it, you pull your remaining 7 out but the number 7 will change to 5, charging you the original price for it.
I don't know if it'll help the ones going through the tickets to determine why it's doing it or how it can be fixed, I explained it the best I could too, hope it'll get fixed