Please use this forum only for specific extension issues, not for generic seo/joomla ones.

By the way, don't use meta keywords at all, forget about them. Since years they are no more used and evaluated by search engines and can be even dangerous for SEO penalties if misused. About the description, Joomla uses a complex chain of overrides so the meta desc that you set in the Joomla Global Config is normally overwritten somewhere.

My advice if you are a JSitemap user, just use the search engines meta info dashboard, so you can manage title/desc easily for all URLs. It has been developed for this purpouse.

Best regards
John