Download cover results different ((almost) same book)

:welcome:

Edit metadata/Download cover from the same book (in partly very slightly different stages of processing or title/author names) found different results.

What influences this cover search? As seems to indicate my experiments that is a mix of title and author.

Furthermore I would like clarity.

Attachment 146424
Title: Der goldene Esel
Author: Apuleius von Madaura

Attachment 146425
Title: Der goldene Esel
Author: Apuleius

Attachment 146426
Title: Der goldene Esel (GE)#orig
Author: Apuleius von Madaura

Attachment 146427
Title: Der goldene Esel
Author: Apuleius von Madaura

The last two books are 100% identical (original), except for the title.

The results (cover selection) of the first and last book are identical, although the first is already edited, the last original. Obviously, the degree of editing does not matter.

Attached Thumbnails