Hello,
Thank you for contacting Rank Math, and sorry for any inconvenience caused.
While checking your sitemap I found there are currently two issues you have on your sitemap.
1. /?sitemap=1 is not being redirected to the /sitemap_index.xml.
To fix this, please try setting a redirect rule to redirect from /?sitemap=1 to /sitemap_index.xml by following the guide below, or you may also ask your hosting provider to do that.
https://rankmath.com/kb/sitemap-404-error/#nginx-apache-server
2. Your /?sitemap=1 is having a parsing error and this is why it’s showing a blank page.
These issues are most likely related to your server configuration. So, I suggest you to get in touch with your hosting provider regarding this issue.
Apart from the above issue: I see lots of unwanted links in the sitemap. I would suggest please contact hosting provider to run the malware scan, I suspect your website is hacked.
Can you please follow these steps?
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/
Then remove all the sitemaps from the search console and submit sitemap_index.xml and wait for Google to crawl the sitemap.
That should fix the issue.
If the issue persists, it would seem like a conflict with any plugin or theme.
To determine that, update all the plugins and themes and follow this guide:
https://rankmath.com/kb/check-plugin-conflicts/
I hope this helps. Looking forward to helping you.
Thank you