why custom post archive gives always no more than 10 posts despite of paging settings?

Ok, found the issue. By analizing the generated query, I realized that it rightly searched for current language posts. I’m currently use polylang as the multilingual plugin, and it correctly associate posts with a ‘language’ taxonomy.

Now, I had far more 10 project posts but only 10 where of the current language.

All fine now.