Yes, this just happened to me twice tonight. Posted Favor of the Bazaar and Favor of the Pavilion was posted in its place (a 5 silver item instead of the 12 gold item). Cost me over 60 silver in listing fees. Then a bit later I went to post a dagger at 16 silver and cloth gloves (market price: 3 silver) were posted instead. I think the issue is that right-clicking the item and selecting “Sell at Trading Post” opens in the “Trading Post” tab not the “Sell at Trading Post” tab.
I usually manually switch to the “Sell at Trading Post” tab and sort the items by price, but tonight I didn’t do that.