Hello,
Thank you for contacting Rank Math and sorry for any inconvenience that might have been caused due to that.
It is not recommended to create two sitemaps for the same items on your site. This means that you can either disable the posts and CPTs in the Jetpack sitemap and only enable the news sitemap because the Rank Math sitemap already contains posts, pages, image entries. Aternatively, you can disable the Rank Math sitemap module and use the JetPack sitemap only.
I hope this info helps. 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.