URLs is indexed but doesn’t show up in the search results

Some of the URLs marked as indexed in Google search console are not shown in search results when related keywords is searched.

The URLs in question include query strings and their canonical URL is identical.

As an example:

1- https://jupiterx.artbees.net/jupiter-x-templates/?category=service is marked as indexed but when searching jupiter x service templates​ it does NOT show up in results (checked the first 10 pages but apparently in no other pages either.

2- https://jupiterx.artbees.net/jupiter-x-templates/?category=events is marked as indexed but when jupiter x events templates​ it DOES show as in the first result.

Considering https://jupiterx.artbees.net is the most authoritative domain related to jupiter x templates​ (product’s official website), so the reason some URLs do not show up in the results, is competition or something is technically wrong?

I’ll appreciate your time and help.