I was server hopping last night and also checking the prices on the companion app to make things a bit quicker and came across what I was looking for.. however the prices were totally different and when I checked them just now they had not changed..
Item: Gatherer's Guerdon Materia X
Server:Goblin
App price and history ranging 5,400 up
actual market board-15,400 up
It thankfully for you guys won't let anyone buy it on the app but just a weird bug I came across companion app price companion history
no purchase allowed
actual market price and history

It isn't a horrible bug, just thought I would mention it bc it may throw a lot of people off like it did me LOL