Check the Language setting and run the products again.
RANKit writes in the language set in Settings → AI Generation Preferences → Language, not the language of your product pages. The default is English.
Fix it
- Select the right Language and click Save in the save bar.
- Write your keywords and custom prompt in the same language.
- Run a new task for the affected products with Skip previously processed products turned off.
Remember that the interface language is a separate setting: changing Interface language does not change the language of your meta tags.