Brief Description of Bug

I attempted to buy a Heroic BoE pair of gloves for 50k (precisely).
After clicking the buy button in the pop up window, I got prompted to buy another, even though there was only one at this price.

Opening the mailbox, I found a normal version of the same gloves, which I had apparently bought at 50k (precisely again). I returned to the auctioneer, constated that the heroic item was still for sale and bought it through the blizzard interface. No other normal version was up for this specific price, so I'm fairly confident this isn't just user error.

Steps to Reproduce

Find an item listed both with normal and heroic versions at the same price (putting them up yourself might work, but you need to be able to buy it).
Attempt to buy it.

This might not be reproducible 100% of the time, as the first item returned may be the correct one (the 'buy again' part of the bug would likely still happen).

Loaded Addons

ArkInventory
ArkInventoryRules
ArkInventoryRules_MoreRules
ArkInventorySearch
Auctionator
GemChipHelper
idTip
TradeSkillMaster
TradeSkillMaster_Accounting
TradeSkillMaster_AppHelper
TradeSkillMaster_AuctionDB
TradeSkillMaster_Auctioning
TradeSkillMaster_Crafting
TradeSkillMaster_Destroying
TradeSkillMaster_Mailing
TradeSkillMaster_Shopping
TradeSkillMaster_Vendoring
TradeSkillMaster_Warehousing

Back Trace (LUA Error Output)

Not applicable

PS: Fortunately, I should be able to resell the normal item at the same price, so this is more an inconvenience than an outright loss, but in other cases it could be more dramatic.

Seems very related to issue #264