In short, often times using AucDB pricing as Default pricing model and StdDev as Alternate pricing model in Appraiser will switch over to StdDev incorrectly.
As you can see, I [Prosperina] have 2 Glyphs up at the wrong price [default(StdDev)] because I used Batch Posting after making sure all items were showing the correct pricing model [default(AucDB)], but obviously Batch Posting also causes the pricing model to switch like Refresh does.
I never had this issue when I used WoWEcon as my Default pricing model and StdDev as my Alternate pricing model.
Edit: Apparently, adding an image in this posting editor just doesn't work.