@jasonmagnuson
If the issue happens when Yoast is the only plugin active and your theme is 2016 we ask that you please create a new GitHub issue here: https://github.com/Yoast/wordpress-seo/issues/ for our developers. They can then review the report and respond back as needed. Please report the issue to a third party developer as well. If you are not sure how or what to report use this guide: https://kb.yoast.com/kb/how-to-write-a-good-bug-report/
If you didn’t find any conflicts or errors, we think the issue is specific to your site. We’d need to investigate further but are unable to do so on these forums. You can purchase Yoast SEO Premium here: https://yoast.com/wordpress/plugins/seo/ and receive our Premium email support and we can help you further.
@ardellan
That sounds like some sort of conflict. Can you please check for conflicts using this guide: https://kb.yoast.com/kb/how-to-check-for-plugin-conflicts?? If there is a conflict with a plugin or a theme, you can create a new GitHub issue here: https://github.com/Yoast/wordpress-seo/issues/ for our developers. Please report the issue to a third party developer as well.
If you didn’t find any conflicts or errors, we think the issue is specific to your site. We’d need to investigate further but are unable to do so on these forums. You can purchase Yoast SEO Premium here: https://yoast.com/wordpress/plugins/seo/ and receive our Premium email support and we can help you further.
In regards to Simple WP Member Login, we have had some issues related to it here but none describe your experience. That conflict check would be the best thing to perform to confirm where the issue lies.