Seller listing multiple copies of the same number on eBay

What is going on with this seller? He just sold two copies of Masters of Science Fiction: Fritz Leiber recently, and now he has two different listings up right now, both of which include #154.

https://preview.tinyurl.com/y6ppqyvn

https://preview.tinyurl.com/y2obwbfa

No connection to seller, but I have purchased a book from them and now I'm wondering what's going on.

Maybe they just didn't want to retake the photos.

In the description both descriptions they state this is #154. I was just worried I bought a counterfeit or something.

I looked quickly at this yesterday but didn't have time to post. The listings in those links show perhaps that same #154 but the one listing shows a second book. It's likely that the seller is offering the same #154 via two avenues and would take the corresponding listing down when one of the two have sold. Does the second book have its own listing, as well? (I forgot to check...)

>4 treereader:
Oh, gotcha. Thanks. It's listed once on its own and once with #154 of James Patrick Kelly. There has been a bid on the single copy now for a bit. I wonder what they will do if someone bids on the set now.

>5 HermeticHermit:

They'll have to explain to eBay why they listed the same item in two listings. But that's only an issue if both items sell and someone loses out.

If I recall, both of those books were released at the same time, so Centipede would have sold them in matching numbers whenever possible. In fact, Centipede will try to keep all issues in a particular series matching for customers buying them. In other words, if you bought both of those books, you could ask Jerad at Centipede to reserve 154 for you in the Masters of Science Fiction series.

I see.Thank you both for your information.