I attempted to sell three Wolpertinger Hoodies for about three gems each in a single stack and got this:
https://www1.flightrising.com/auction-house/ajax/sell/verify
A non-numeric value encountered in /AuctionHouseController.php Line 2867
https://www1.flightrising.com/auction-house/ajax/sell/verify
A non-numeric value encountered in /AuctionHouseController.php Line 2867