Whether the Spanish is shown or not, the English version should be the primary listing on both pages. It was published in 2020, the translation in 2021, so there is no chronological reason.
This is part of a current bug whereby the most popular book is no longer the default edition. You're welcome to report to Support, but there's unfortunately nothing librarians can do about it at this time.
https://www.goodreads.com/series/3150...
Book 1 is shown only as :
Plomo al cuadrado
https://www.goodreads.com/book/show/5...
which is the Spanish translation of the book
Triggernometry
https://www.goodreads.com/book/show/5...
Same on the author's page:
https://www.goodreads.com/author/show...
ONLY the Spanish edition of the book is listed, the English one does not appear.
Whether the Spanish is shown or not, the English version should be the primary listing on both pages. It was published in 2020, the translation in 2021, so there is no chronological reason.