Closing Collection with a Question

 I have now completed my Armada Ghost book collection, but with the addition of today's  rejigged cover art reprints has left me with a question to which I can find no answer. 

Everyone who has made it a mission to collect this anthology series of ghost stories soon discovers there are several alternate reprints amongst their number with variant re-imaginings of their cover art. These can be seen in my Collection page here.

That stated, I have also noted that these Series 2 reprints also appear under various imprints. As seen below, these imprint versions are almost identical to their Armada counterparts, with the exception of the deletion of their title's reference to Armada.

 

 

The name of these Armada alternatives appear under a dragon logo:

Until this morning's final Armada Ghost Book delivery, I had been under the impression that when these Dragon version of these books appeared, Armada had already folded and had sold the right to their design to content to this alternate publisher. It was the only explanation I could muster to explain the existence of these non-Armada editions. But now I can only assume that my assumption must be incorrect. Why? Look at the price-tags on the Armada and Dragon versions of the same book. The Armada version is a fair chunk pricier than the Dragon books. Which is, frankly, frustrating as I can't understand why these non-Armada books exist?

Does anyone know?