Hi. When your plugin is active, Yoast SEO is unable to display sitemaps. Supposedly they are working fine.... but they just can't be viewed (a blank page appears when I click view sitemap). Their devs identified the issue to be with your plugin. When it's disabled, everything works fine. Below is the feedback from their devs. Can you update UsageDD to resolve this conflict? Thanks for a terrific tool, cheers! MD
Thank you for getting back to us.
We have inspected the source code of your sitemap and noticed that extra code is being added at the end of the sitemap (outside the red section in the attached image). That code appears to be generated by a plugin which works only for logged in users, it is very likely to be generated by the UsageDD plugin.
You can either disable it or contact the developers of that plugin to add sitemap pages to exclusions list (unless this is already possible). However, please keep in mind that this issue appears only for logged in users, search engines should have no problems to crawl your sitemap, so you should not worry about it hurting the SEO efforts of your website.
Please let us know if you have any other questions or need any help.