Astramentis is gone - No sale

Got the Astramentis and put it up for sale through the website. A Chinese player came and offered a trade, I put it up he started throwing not divine spheres but alchemy spheres very quickly. I put the item back in my inventory, the trade was canceled (I saw this sign). The astromentis itself was in my inventory, I put it back with a combination through the ctrl key, but it was not added to my chest and there was no sound that I put it. Is this a new bug? Or is this a new way to get better items without trading? [Removed by Support] Re-entered the game and the amulet just vaporized, or the Chinese player has it now, and I'm really curious if GGG support will reimburse me for this item. 288 divine spheres somehow lost, the amulet was at +88 to all atrimuths and -4 incoming damage.... Sad in general, beware of such cases.

Did you check your stash tab with Unique affinity?