Hello,
Thank you for contacting Rank Math and bringing your concern to our attention. I’m sorry for any inconvenience this issue may have caused you.
You can go to your WordPress Dashboard > Rank Math > Sitemap Settings and in the General Tab, you can edit the Links Per Sitemap setting from 200 (default):
http://prnt.sc/vu8tsy
If the issue persists, please ensure you have added your sitemap URLs to be excluded from caching, then resave your permalinks and sitemap settings, not forgetting purge your cache.
Having done that, check your sitemap and let us know if the issue still persists.
I hope these help. Thank you and looking forward to your update.
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.