At the Auction House if you mouse over the Dragonflight green for sale it is 32g to vend the item.
When you read, the user has posed the item for 2g.
You purchase the item for 2g.
You go to sell it for 32g. It will vend for 1g50s.
This probably can’t be fixed. On the initial search screen in the AH, similar items are grouped together to make it more readable (eg if there are 5 of the same name it will show the cheapest one and there will be a 5 in one of the columns). But because of scaling items of the same name can be of different ilvls and have different vendor prices. So when you mouseover it shows you the “base” price, ie the price it would be if it dropped at its natural ilvl without scaling.
The price you need to look at is the one on the second screen. After you click on the item on the first screen it takes you to another screen where it lists all available items of that name individually. Here the mouseover vendor price should be correct.