Hello,
Thank you for contacting the support and sorry for any inconvenience that might have been caused due to that.
Sorry for the issue you are facing.
Assuming you are using the latest version of all the plugins and the themes (please update if not yet), it could be a conflict with one of the plugins or the theme you are using (apart of Rank Math).
To determine that, please follow this troubleshooting guide:
https://rankmath.com/kb/check-plugin-conflicts/
Please let us know if you find the culprit.
Only the site admin would know and your users won’t be affected by this troubleshooting.
Looking forward to helping you.
I tried to check the the plugin conflict and I’ve recieved such error messange in Troubleshooting Mode – https://yadi.sk/i/kzF0HZheLsGaVA
We might need to take a closer look at the settings. Please edit the first post on this ticket and include your WP logins in the designated Sensitive Data section.

It is completely secure and only our support staff has access to that section. If you want, you can use the below plugin to generate a temporary login URL to your website and share that with us instead:
https://wordpress.org/plugins/temporary-login-without-password/
You can use the above plugin in conjunction with the WP Security Audit Log to monitor what changes our staff might make on your website (if any):
https://wordpress.org/plugins/wp-security-audit-log/
We really look forward to helping you.
Hello,
I have updated the sensitive data as requested. Can you please check further?
Thank you.
Hello,
Thank you for the update.
You seem to have forgotten to include your site URL. Please update so we can look into your issue
Looking forward to helping you. Thank you.
Hello,
I have updated the sensitive data as requested. Can you please check further?
Thank you.
Hello,
Thank you for the update
I have checked your site and it seems to be a conflict arising withspeculantu.ru.2019
theme. The button works well with other the other ones. Please check the screen cast I have attached in the sensitive section.
Looking forward to helping you. Thank you.
Hello,
Were you able to check it? Do you need more help to solve it or do you want us to set this thread as solved? Keep in mind we will be here for any other questions or issues you might have in the future.
Looking forward to help you.
Yes! I’ve solved the problem. Thanks.
Hello,
We are super happy that this resolved your issue. If you have any other questions in the future, know that we are here to help you.
If you don’t mind me asking, could you please leave us a review (if you haven’t already) on https://wordpress.org/support/plugin/seo-by-rank-math/reviews/#new-post about your overall experience with Rank Math? We appreciate your time and patience.
If you do have another question in the future, please feel free to create a new forum topic, and it will be our pleasure to assist you again.
Thank you.