Hello,
Thank you for contacting Rank Math and sorry for any inconvenience that might have been caused due to that.
Your sitemaps appear to be cached. Please add all your sitemap URLs to be excluded from caching. Once done, please do the following:
1. Head over to WordPress Dashboard > Settings > Permalinks
Hit the save button once.
2. Go to WordPress Dashboard > Rank Math > Sitemap Settings
Hit the save button once.
That should fix the issue.
You can create a test post and check your sitemap in a private browser(to avoid browser caching).
If the issue persists, please do let us know so we can look at this further.
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.