Rank Math with Mega Main Menu

Hello,

Thank you for reaching out to us and sorry for any inconvenience that might have caused due to that.

Have you tried updating/downgrading the Mega Main Menu plugin as sometimes new updates from the plugin cause this type of issue?

Here’s a similar issue from another ticket that has been resolved just by updating/downgrading their Mega Main Menu plugin: https://support.rankmath.com/ticket/rank-math-for-pages-and-product-is-not-working/

If the issue persists, we might need to take a closer look at the settings. Please edit the first post on this ticket and include your WordPress & FTP 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.

P.S: You might want to contact the Mega Main menu plugin developer about this as well. Perhaps they have a solution as well.