Hello,
Thank you for contacting Rank Math and bringing your concern to our attention.
Assuming you have already followed the steps in our guide here:
https://rankmath.com/kb/yoast-seo-migration/
Please check your posts if the metadata (titles, description, keywords, etc.) are already imported by editing them

Let us know how this goes.
Thank 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.