Hello,
We apologize for the issue you are facing with leftover Yoast custom fields after migrating to Rank Math. To completely clean up the Yoast data, you can follow these steps:
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Navigate to Import & Export in Rank Math: Go to WordPress Dashboard → Rank Math SEO → Status & Tools and select Import & Export.

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Navigate to the Other Plugins Section: Scroll down to find the section for other plugins.

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Clean the Database: Click on Clean to erase any remaining database records related to the Yoast SEO plugin. You will receive a confirmation message; click OK to proceed.

After this, you should see a success message confirming that the cleanup was successful.

If you still encounter issues or if there are specific custom fields that remain, please reply to this ticket with your site URL, and a human agent from our support team will assist you further.
Thank you for raising this concern, and we hope this helps resolve your issue!
Sources:
How to Remove Yoast Data After Moving to Rank Math » Rank Math
Hello,
There is no Yoast on Other Plugins
here my website url : https://guideyourtrip.com/
Hello,
In this case, if you would like to delete the old Yoast data, you can follow the steps here:
https://yoast.com/help/how-can-i-uninstall-my-plugin/#database
Looking forward to helping you.
I have also already deleted all the yoast tables, however a yoast custom field remains as I explained above.
Hello,
In this case, 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.
Please do take a complete backup of your website before sharing the information with us.

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,
Since we did not hear back from you for 15 days, we are assuming that you found the solution. We are closing this support ticket.
If you still need assistance or any other help, please feel free to open a new support ticket, and we will be more than happy to assist.
Thank you.