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Hello @buzzztube

Thank you for contacting the support and sorry for the issue you are facing there.

It seems like you are using WordPress 4.x and there is an outstanding bug with the older versions of WordPress:
https://rankmath.com/changelog/#known-issues

We will be releasing an update soon which shall fix the issue.

You can upgrade to the latest version of WordPress & use the Classic Editor plugin to solve the issue for you.

Hope that helps.

Hello @buzzztube

Please update to the latest version. That should fix the issue.

Appreciate your patience.

Thank you.