Please include as much of the following information as possible to help me fix the bug:

I was on AH in SW, buying Arcane Powder. Saw that there was a few stacks avalible at a low cost. Looked away for a brief second and when i looked back I had just bought one Powder for 3400 gold. The Auction listings looked excatly as they look in the screenshot. I posted one for the same price so that you can see excatly what my screen looked like.

I was saving up for the swift flying mount. GG Auctionator. Countless grinding hours gone in a swift moment.

I'm really sorry about that.

Did it show the correct price in the buy-confirm popup? I've tried using Chain Buy and can't replicate the behaviour.

I've added a new warning that interrupts purchases when the price jumps up a lot (in alpha at the moment), which should resolve this issue.

Closing (if that doesn't help reply here and I can reopen the issue)