I have seen this multiple times now, and this last time it cost me just over 700k…
There is a bug in the BMAH which DOES NOT show you when some items are already already known in the item’s tooltip.
For several weeks I have been watching and bidding on the Swift Zulian Panther. I have held my mouse over the item icon in the BMAH many times and even Ctrl-Clicked it to view it. But it has NEVER said that it was already known. Today I finally won it for 700k. I opened my email and right clicked it to add it to my collection and it wouldn’t let me. I tried multiple times before I noticed the red “Already Known” text on the item in my bag. Again, I had never seen the “Already Known” text within the BMAH list and item icon.
This same bug almost caused me to buy another mount that I was certain that I owned but the tooltip didn’t say “Already Known” on it either and luckily i was outbid. The next time I saw it (about 2-4 days later) I intended to bid again but this time it showed the “Already Known” text in the tooltip. That time it was the Glacial Tidestorm mount.
I have seen this happen with some toys and pets as well. Unfortunately, I do not remember which ones
I already know that I am not likely to get a refund, but please at least look into what is causing this to happen.
Thanks!