a trade from someone else appeared under my trades

Since a few days I've a trade from someone else in my trades. It says listed by me but that trade was from Graphene and not me. I cannot delete or even open it because the site says it already is deleted. However the trade is still there:
Steps to reproduce:
I first posted in the trade ("have 3x key of terror" which is now the description) but then deleted my post. I guess Graphene (the original poster) deleted the whole trade after some time. That somehow lead to this strange trade with -1 posts.

Here's the trade link:
trade/key-of-terror-t1566618.html

From a moderator view, when opening the trade, it looks like the only post in there is by atari, saying "have 3x

Key of Terror". No trace of the original author.
The moderator logs also says that atari bumped the topic 2025-02-26T06:29:00   This timestamp has been automatically converted to your local date/time for convenience. The format is DD/MMM/YYYY, HH:MM am/pm. This is based off your browser time. , which I guess coincides when it was actually deleted by Graphene?
I could permanently delete it but leaving it up for now for @Teebling to have a look.

Teebs - when the OP of a trade deletes the trade topic, do the posts by other users somehow remain behind in a ghost trade topic without the original post? Could it be tied with that atari had already soft-deleted his own post prior to the topic deletion?