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Hello @guptabittoo4,
Thank you for contacting the support and sorry for the inconvenience caused.
Can you please follow these steps?
1. Flush the Sitemap cache by following this video screencast:
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:
That should fix the issue. Please let us know if that does not. We are here to assist.