Hello,
Thank you for contacting Rank Math support, and sorry for any inconvenience that might have been caused due to that.
Please ensure that when changing post/page URLs, you establish a redirection so Google can acknowledge the changes and reflect it on the SERP.
You may refer to our dedicated guide about it here: https://rankmath.com/kb/how-to-redirect-posts-after-changing-urls/
After all that, allow Google some time to recrawl the updated pages.
Hope that helps and please do not hesitate to let us know if you need our assistance with anything else.
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.