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Glad to help:
1) “Should it be doing this?”
No the plugin doesn’t do anything like redirect or anything other than disable WP sitemaps. Literally only one line of code in this plugin:
add_filter('wp_sitemaps_enabled', '__return_false');
So most likely some other plugin that is doing it. Maybe an SEO plugin or similar.
2) “under sitemaps it shows as two sitemaps”
Yeah it sounds like this issue may be related to the first one. I would try doing some basic troubleshooting of your plugins (and theme). That will help you understand what is happening (with both issues), by which plugin, etc.
I would be glad to share a troubleshooting guide if it will be useful for you.