"robots.txt" Ignored

Hello,

I started using this plugin last week, and since then my meta description has not been showing. It only shows content taken from the homepage.

I did go to Webmaster Tools and did a Fetch as Google, which seemed to work fine. When I went to “robots.txt Tester” it shows:

User-agent: *
Disallow: /wp-admin/

Sitemap: http://prestigemedical.org/sitemap.xml
<!– ignored –>

The automatically generated robots.txt shows as:

User-agent: *
Disallow: /wp-admin/

Sitemap: http://prestigemedical.org/sitemap.xml

Is that how it is supposed to be? I am not sure what to do, any help is appreciated.

Also, I do not know if this is related or not, but I noticed when I fetch my site as http://www.prestigemedical.org/, it just shows as 301 moved permanently to http://prestigemedical.org/. My WordPress site does show the site without www, so I assume that is fine. Just wanted to make sure.

https://ww.wp.xz.cn/plugins/google-sitemap-generator/