So here's my issue. I put in the trade market a Tempered Core and left it for a few days in hopes to sell it. Which occured.. in a weird manner. On Friday 7th february : I was looking for items in the shop, and suddenly got kicked out. I right clicked back onto the NPC, but it gave me an erroe message during a few minutes, until I saw a message in the chat noticing me about succesfully selling this Tempered Core. But that's when weirdness occur. When checking the Trade section, the item was still there. I thought about a bug, and decided to let it be since it was still in a "selling" state On Saturday 8th february : Item was still there, so I decided to cancel the trade. At my big surprise, I was unable to pick back the item from its slots, due to the "red cross" not appearing in the GUI, pretty much like the screenshot I've done linked in this post. I then decided to left it, believing it'd get fixed by the next day... But it didn't. I'm still having a trade slot taken by this odd bug... So that's about it. I can share my logs if needed, just can't tell if it'd be useful or not.