Hello,
Thank you for contacting us and sorry for any inconvenience that might have been caused due to that.
Can you please share the sitemap URLs so we can check further for you?
Then, please follow the steps below:
#1. Flush the Sitemap cache by following this video screencast:
https://i.rankmath.com/pipRDp
#2. Exclude the Sitemap files of the Rank Math plugin in your caching plugin. The cache could be via a plugin or from the server. For plugins or Cloudflare, please follow this article:
https://rankmath.com/kb/exclude-sitemaps-from-caching/
#3. If the above steps don’t seem to work, kindly apply the following filter code to your site.
add_filter( 'rank_math/sitemap/enable_caching', '__return_false');
Here’s how you can add filter/hook to your WordPress site:
https://rankmath.com/kb/wordpress-hooks-actions-filters/
However, if the issue persists, we need to investigate this further on your website. Please edit the first post on this ticket and include your WordPress & FTP logins in the designated Sensitive Data section.
Please 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.