Hello @adrean
Thanks for using the Yoast SEO plugin. It generates a sitemap index (sitemap_index.xml) based on the content types (posts, pages, products, taxonomies, custom posts types etc). And of course, depending on your choice, indiviual sitemaps can be turned ON or OFF. You should only submit the sitemap_index.xml but you can have as many individual sitemaps as necessary in the sitemap index.
Your homepage will appear in the post-sitemap and page-sitemap if you have set your homepage to display latest posts in WordPress > Settings > Reading. It’s expected behavior. The page sitemap always includes the homepage, and there isn’t a way to exclude it. The post sitemap includes the post archive as the first link. It’s not an issue.
Alright, thanks a lot @maybellyne
So what I understand is that everything seems to be alright. Thats great!
Thank you and have a great day.