Hello,
We apologize for the issue you are facing with your sitemap displaying incorrectly. Here are a few steps you can take to troubleshoot this problem:
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Validate Your Sitemap: Use the Validate XML Sitemap tool to check if your sitemap is correctly configured. This will help identify any issues.

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Ensure the Sitemap is Located in the Root Folder: Make sure your sitemap is located at `https://rankmath.com/wp-content/uploads/2023/04/An-example-displaying-how-to-validate-a-sitemap-2.png with only one forward slash between your domain name and sitemap path.
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Check Post Indexing Settings: Ensure that your posts are set to index. Go to Rank Math SEO → Titles & Meta and enable the Index checkbox in the Robots Meta settings.

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Exclude Sitemap from Caching: If you have caching plugins, ensure that your sitemap is excluded from being cached. You can follow this tutorial on excluding sitemaps from caching.
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Check for Plugin Conflicts: Sometimes, other plugins may conflict with Rank Math. You can use the Health Check plugin to identify any conflicts.
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Custom Canonicals: If you have added custom canonicals to your posts, they may not appear in the sitemap. Consider removing them to allow Rank Math to generate the canonical URLs.
If these steps do not resolve the issue, please reply to this ticket, and a human agent from the Rank Math Support team will assist you further.
Sources:
Rank Math Sitemap Issues and Their Fixes » Rank Math
How to Fix "Incorrect HTTP Header Content-Type" Error in Sitemaps » Rank Math
Troubleshooting the “Couldn’t Fetch” Error in Google Search Console » Rank Math
This is an automated reply from Rank Math Support Bot. If you need further assistance, please reply to this topic and a human support agent will reply to you shortly.
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.