sitemap being indexed?

Hi, I’m really new to WordPress/themes/plugins etc. but learning. Yesterday I review my site with site:www.mysitename.com to see what pages may be indexed and I found a few sitemap_post_tag.xml.gz and sitemap_post.xml.gz I clicked on these and of course they didn’t bring me to one of my webpages, but rather downloaded a file to my computer. The plugin I am using is the All In One SEO Pack, I’ve gone through the settings for the plugin inside and out and I haven’t a clue what I should do ?? clueless.. Any help would be so appreciated. Thank You for your time.
Jo.

https://wordpress.org/plugins/all-in-one-seo-pack/