Custom page for a specific page returns the archive page

Hi I’m having a strange problem, in a project I’m working on I’ve created almost 50 custom pages for specific pages (and they all work).
I just added two more pages and strangely they render the archive-page.
The procedure I’m using is always the same:
In the WordPress admin panel, I create the page giving a specific name and “slug”,
then in my theme folder (same place as the other working pages), I create a document called page-slug.php, and inside I code the content of that custom page.
In the past, I had a similar problem and it was enough to resave the permalinks one or more times, and the problem went away. This time it persists.
Does Anyone have any Idea Why?

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